You also won't need an instruction manual for a lot of other things, because you won't be able to do them at all.

It's open source, I could do it.

Oh but that's needlessly hard and annoying? Well so are Vim and Emacs.

>> and both have non-terminal interfaces.

> I don't need an instruction manual to figure out how to close VSCode.

To close GVim, you click the 'x' in the upper right/left corner, like any other window.

To close the GUI Emacs, you may just click the X as well.

True, how did I forget?

In Vim, pressing Ctrl-C (which is how you usually terminate a console application) tells you to write :quit<enter>.

Alternatively, you could just close the terminal window.

And how do you install extensions for GVim?

You put extensions into the proper folder, or use a tool like 'Vundle'. Yes it's slightly more difficult than using Atom, but anyone who can use a tool like Git or Cmake should have no problems figuring it out.