diff --git a/helpers/helpers.v2.1.d/apps b/helpers/helpers.v2.1.d/apps
index c010dab2b..474f5e45f 100644
--- a/helpers/helpers.v2.1.d/apps
+++ b/helpers/helpers.v2.1.d/apps
@@ -134,7 +134,7 @@ ynh_spawn_app_shell() {
     # Force Bash to be used to run this helper
     if [[ ! $0 =~ \/?bash$ ]]
     then
-        ynh_print_err --message="Please use Bash as shell"
+        ynh_print_warn --message="Please use Bash as shell"
         exit 1
     fi
 
@@ -142,13 +142,13 @@ ynh_spawn_app_shell() {
     local installed_apps_list=($(yunohost app list --output-as json --quiet | jq -r .apps[].id))
     if [[ " ${installed_apps_list[*]} " != *" ${app} "* ]]
     then
-        ynh_print_err --message="$app is not in the apps list"
+        ynh_print_warn --message="$app is not in the apps list"
         exit 1
     fi
 
     # Make sure the app has its own user
     if ! id -u "$app" &>/dev/null; then
-        ynh_print_err --message="There is no \"$app\" system user"
+        ynh_print_warn --message="There is no \"$app\" system user"
         exit 1
     fi
 
@@ -156,7 +156,7 @@ ynh_spawn_app_shell() {
     local install_dir=$(ynh_app_setting_get --key=install_dir)
     if [ -z "$install_dir" ]
     then
-        ynh_print_err --message="$app has no install_dir setting (does it use packaging format >=2?)"
+        ynh_print_warn --message="$app has no install_dir setting (does it use packaging format >=2?)"
         exit 1
     fi
 
diff --git a/helpers/helpers.v2.1.d/apt b/helpers/helpers.v2.1.d/apt
index 2e13f1186..24e5b5f99 100644
--- a/helpers/helpers.v2.1.d/apt
+++ b/helpers/helpers.v2.1.d/apt
@@ -28,7 +28,7 @@ ynh_wait_dpkg_free() {
                 # Check if the name of this file contains only numbers.
                 if echo "$dpkg_file" | grep --perl-regexp --quiet "^[[:digit:]]+$"; then
                     # If so, that a remaining of dpkg.
-                    ynh_print_err --message="dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem."
+                    ynh_print_warn --message="dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem."
                     set -o xtrace # set -x
                     return 1
                 fi
diff --git a/helpers/helpers.v2.1.d/backup b/helpers/helpers.v2.1.d/backup
index 21ee091a4..0f34e9bc9 100644
--- a/helpers/helpers.v2.1.d/backup
+++ b/helpers/helpers.v2.1.d/backup
@@ -108,7 +108,7 @@ ynh_backup() {
 
     # Check if dest_path already exists in tmp archive
     if [[ -e "${dest_path}" ]]; then
-        ynh_print_err --message="Destination path '${dest_path}' already exist"
+        ynh_print_warn --message="Destination path '${dest_path}' already exist"
         return 1
     fi
 
diff --git a/helpers/helpers.v2.1.d/fail2ban b/helpers/helpers.v2.1.d/fail2ban
index be9f2da95..05fe0ea2b 100644
--- a/helpers/helpers.v2.1.d/fail2ban
+++ b/helpers/helpers.v2.1.d/fail2ban
@@ -109,7 +109,7 @@ ignoreregex =
 
     local fail2ban_error="$(journalctl --no-hostname --unit=fail2ban | tail --lines=50 | grep "WARNING.*$app.*")"
     if [[ -n "$fail2ban_error" ]]; then
-        ynh_print_err --message="Fail2ban failed to load the jail for $app"
+        ynh_print_warn --message="Fail2ban failed to load the jail for $app"
         ynh_print_warn --message="${fail2ban_error#*WARNING}"
     fi
 }
diff --git a/helpers/helpers.v2.1.d/logging b/helpers/helpers.v2.1.d/logging
index 4af30af85..06b8d5083 100644
--- a/helpers/helpers.v2.1.d/logging
+++ b/helpers/helpers.v2.1.d/logging
@@ -36,15 +36,6 @@ ynh_print_info() {
     echo "$message" >&$YNH_STDINFO
 }
 
-# Main printer, just in case in the future we have to change anything about that.
-#
-# [internal]
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_print_log() {
-    echo -e "${1}"
-}
-
 # Print a warning on stderr
 #
 # usage: ynh_print_warn --message="Text to print"
@@ -58,65 +49,7 @@ ynh_print_warn() {
     ynh_handle_getopts_args "$@"
     # ===========================================
 
-    ynh_print_log "${message}" >&2
-}
-
-# Print an error on stderr
-#
-# usage: ynh_print_err --message="Text to print"
-# | arg: -m, --message=     - The text to print
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_print_err() {
-    # ============ Argument parsing =============
-    local -A args_array=([m]=message=)
-    local message
-    ynh_handle_getopts_args "$@"
-    # ===========================================
-
-    ynh_print_log "[Error] ${message}" >&2
-}
-
-# Execute a command and print the result as an error
-#
-# usage: ynh_exec_err your command and args
-# | arg: command - command to execute
-#
-# Note that you should NOT quote the command but only prefix it with ynh_exec_err
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_exec_err() {
-    # Boring legacy handling for when people calls ynh_exec_* wrapping the command in quotes,
-    # (because in the past eval was used) ...
-    # we detect this by checking that there's no 2nd arg, and $1 contains a space
-    if [[ "$#" -eq 1 ]] && [[ "$1" == *" "* ]]
-    then
-        ynh_print_err --message="$(eval $@)"
-    else
-        # Note that "$@" is used and not $@, c.f. https://unix.stackexchange.com/a/129077
-        ynh_print_err --message="$("$@")"
-    fi
-}
-
-# Execute a command and print the result as a warning
-#
-# usage: ynh_exec_warn your command and args
-# | arg: command - command to execute
-#
-# Note that you should NOT quote the command but only prefix it with ynh_exec_warn
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_exec_warn() {
-    # Boring legacy handling for when people calls ynh_exec_* wrapping the command in quotes,
-    # (because in the past eval was used) ...
-    # we detect this by checking that there's no 2nd arg, and $1 contains a space
-    if [[ "$#" -eq 1 ]] && [[ "$1" == *" "* ]]
-    then
-        ynh_print_warn --message="$(eval $@)"
-    else
-        # Note that "$@" is used and not $@, c.f. https://unix.stackexchange.com/a/129077
-        ynh_print_warn --message="$("$@")"
-    fi
+    echo -e "${message}" >&2
 }
 
 # Execute a command and force the result to be printed on stdout
@@ -140,48 +73,6 @@ ynh_exec_warn_less() {
     fi
 }
 
-# Execute a command and redirect stdout in /dev/null
-#
-# usage: ynh_exec_quiet your command and args
-# | arg: command - command to execute
-#
-# Note that you should NOT quote the command but only prefix it with ynh_exec_warn
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_exec_quiet() {
-    # Boring legacy handling for when people calls ynh_exec_* wrapping the command in quotes,
-    # (because in the past eval was used) ...
-    # we detect this by checking that there's no 2nd arg, and $1 contains a space
-    if [[ "$#" -eq 1 ]] && [[ "$1" == *" "* ]]
-    then
-        eval $@ > /dev/null
-    else
-        # Note that "$@" is used and not $@, c.f. https://unix.stackexchange.com/a/129077
-        "$@" > /dev/null
-    fi
-}
-
-# Execute a command and redirect stdout and stderr in /dev/null
-#
-# usage: ynh_exec_quiet your command and args
-# | arg: command - command to execute
-#
-# Note that you should NOT quote the command but only prefix it with ynh_exec_quiet
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_exec_fully_quiet() {
-    # Boring legacy handling for when people calls ynh_exec_* wrapping the command in quotes,
-    # (because in the past eval was used) ...
-    # we detect this by checking that there's no 2nd arg, and $1 contains a space
-    if [[ "$#" -eq 1 ]] && [[ "$1" == *" "* ]]
-    then
-        eval $@ > /dev/null 2>&1
-    else
-        # Note that "$@" is used and not $@, c.f. https://unix.stackexchange.com/a/129077
-        "$@" > /dev/null 2>&1
-    fi
-}
-
 # Execute a command and redirect stderr in /dev/null. Print stderr on error.
 #
 # usage: ynh_exec_and_print_stderr_only_if_error your command and args
@@ -202,32 +93,6 @@ ynh_exec_and_print_stderr_only_if_error() {
     fi
 }
 
-# Remove any logs for all the following commands.
-#
-# usage: ynh_print_OFF
-#
-# [internal]
-#
-# WARNING: You should be careful with this helper, and never forget to use ynh_print_ON as soon as possible to restore the logging.
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_print_OFF() {
-    exec {BASH_XTRACEFD}>/dev/null
-}
-
-# Restore the logging after ynh_print_OFF
-#
-# usage: ynh_print_ON
-#
-# [internal]
-#
-# Requires YunoHost version 3.2.0 or higher.
-ynh_print_ON() {
-    exec {BASH_XTRACEFD}>&1
-    # Print an echo only for the log, to be able to know that ynh_print_ON has been called.
-    echo ynh_print_ON >/dev/null
-}
-
 # Initial definitions for ynh_script_progression
 increment_progression=0
 previous_weight=0
diff --git a/helpers/helpers.v2.1.d/postgresql b/helpers/helpers.v2.1.d/postgresql
index 5423026d2..71be36f8f 100644
--- a/helpers/helpers.v2.1.d/postgresql
+++ b/helpers/helpers.v2.1.d/postgresql
@@ -195,7 +195,7 @@ ynh_psql_database_exists() {
     # though it could exists.
     if ! command -v psql
     then
-      ynh_print_err --message="PostgreSQL is not installed, impossible to check for db existence."
+      ynh_print_warn --message="PostgreSQL is not installed, impossible to check for db existence."
       return 1
     elif ! sudo --login --user=postgres PGUSER="postgres" PGPASSWORD="$(cat $PSQL_ROOT_PWD_FILE)" psql -tAc "SELECT datname FROM pg_database WHERE datname='$database';" | grep --quiet "$database"; then
         return 1
diff --git a/helpers/helpers.v2.1.d/systemd b/helpers/helpers.v2.1.d/systemd
index 748c31cfa..8d63006fe 100644
--- a/helpers/helpers.v2.1.d/systemd
+++ b/helpers/helpers.v2.1.d/systemd
@@ -112,10 +112,10 @@ ynh_systemd_action() {
     # If the service fails to perform the action
     if ! systemctl $action $service_name; then
         # Show syslog for this service
-        ynh_exec_err journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service_name
+        journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service_name >&2
         # If a log is specified for this service, show also the content of this log
         if [ -e "$log_path" ]; then
-            ynh_exec_err tail --lines=$length "$log_path"
+            tail --lines=$length "$log_path" >&2
         fi
         ynh_clean_check_starting
         return 1
@@ -160,10 +160,10 @@ ynh_systemd_action() {
         if [ $i -eq $timeout ]; then
             ynh_print_warn --message="The service $service_name didn't fully executed the action ${action} before the timeout."
             ynh_print_warn --message="Please find here an extract of the end of the log of the service $service_name:"
-            ynh_exec_warn journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service_name
+            journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service_name >&2
             if [ -e "$log_path" ]; then
                 ynh_print_warn --message="\-\-\-"
-                ynh_exec_warn tail --lines=$length "$log_path"
+                tail --lines=$length "$log_path" >&2
             fi
         fi
         ynh_clean_check_starting