Maybe the better analogy is that with vim and nano, we see many text editors and IDEs with GUIs.

Interesting. I'm not so sure about the divide you draw between vim/nano and GUI IDEs. Historically vim and nano were basically the GUIs of their time. Preceding vim was ex and ed, which were basically CLI text editing tools build for the actually printed on paper typewriter interfaces computers like PDPs used to run. If you're not familiar, and you think vim can be obscure ... try running ed MYFILE! It's basically a sort of grep and sed REPL for editing text (where, interestingly, historically tools like grep actually came out of ed not the other way round). Vim can be used in a sort of ed mode with vim -e (AFAIU it's actually ex mode, which is a more advanced version of ed).

So I'd say vim is more like any sort of GUI/TUI or text editor plugin for git and git is like the old ancient CLI equivalent ed that no one knows about or uses anymore because having a visual mode just makes too much sense.

And this is basically where I fall ... I think a vgit should exist, that provides a terminal TUI of some sort, and that as with vim and ed it should totally supplant git while also having a CLI mode too. That this hasn't happened, back to my original point, is a problem and honestly a little strange.