I find it a bit irksome that when discussing command line editors, the dichotomy appears to be be "nano vs vim".

There are other CLI editors. I'm quite partial to ne (the Nice Editor), which has more manageable shortcuts than emacs, a command line (it's still a non-modal editor, to be clear), macros and syntax highlighting. Also jed is not bad. While vim (and nvim) have advantages, and certainly benefit from being ubiquitous and having ther shortcuts replicated in other programs, users should shop around, even on the command line.