For the most part of the CLI methods are unified. If they’re not exactly the same they are very very close from distro to distro.
But the GUI method to add users and groups is all over the place.
I need to do a simple action in Windows, one search, The control has been there for several versions of Windows not necessarily unchanged but definitely in the same general location.
OSX same deal you need to add users groups modify network it’s all been the same place for ages.
Now someone’s trying out Linux, Where’s my network configuration, where’s my user configuration, where’s my group configuration. When the answer to that becomes well what distro, what window manager, we turn away a lot of neophites.