To be sorta serious about editors for a min. I think console editors should definitely be in there because a lot of Linux access takes place over ssh without a GUI.
And Vi/Vim is present everywhere, so it is a must for sysadmins.
Sysadmins can install whatever editor(s) they prefer!
I don't think an intro to GNU/Linux really also needs to be an intro to a text editor at all. Just teach people the man command, tell them a few of the editors that exist, and maybe mention tools like vimtutor.