Add warning line for stable --experimental flag

pynitrokey/cli/nk3/__init__.py

@@ -15,6 +15,7 @@
 from pynitrokey.cli import trussed
 from pynitrokey.cli.exceptions import CliException
 from pynitrokey.cli.trussed.test import TestCase
+from pynitrokey.helpers import local_print
 from pynitrokey.nk3 import NK3_DATA
 from pynitrokey.nk3.bootloader import Nitrokey3Bootloader
 from pynitrokey.nk3.device import Nitrokey3Device
@@ -111,7 +112,9 @@ def update(
     """
 
     if experimental:
-        "The --experimental switch is not required to run this command anymore and can be safely removed."
+        local_print(
+            "The --experimental switch is not required to run this command anymore and can be safely removed."
+        )
 
     from .update import update as exec_update
 
@@ -244,7 +247,9 @@ def factory_reset(ctx: Context, experimental: bool) -> None:
     """Factory reset all functionality of the device"""
 
     if experimental:
-        "The --experimental switch is not required to run this command anymore and can be safely removed."
+        local_print(
+            "The --experimental switch is not required to run this command anymore and can be safely removed."
+        )
 
     with ctx.connect_device() as device:
         device.admin.factory_reset()
@@ -268,7 +273,9 @@ def factory_reset_app(ctx: Context, application: str, experimental: bool) -> Non
     """Factory reset all functionality of an application"""
 
     if experimental:
-        "The --experimental switch is not required to run this command anymore and can be safely removed."
+        local_print(
+            "The --experimental switch is not required to run this command anymore and can be safely removed."
+        )
 
     with ctx.connect_device() as device:
         device.admin.factory_reset_app(application)