Graphical Emacs/VIM were installed on the CS lab machines when I was in college. I’m pretty sure they were part of the default programming environment setup at my first workplace. GUI versions of these apps behave a lot like regular Windows or Mac apps. You can save with CTRL-S, etc. I can totally see how someone could be very experienced in using it and never know there is a keyboard shortcut to quit apart from the ‘x’ on the title bar.

The question would have been better if it was directed to an Emacs feature for which graphical versions didn’t obey ordinary Windows conventions.