The line numbers and position bar are some real quality-of-life enhancements!
I don't regularly use nano anymore, but I have often thought that more programs should imitate the way it shows the command shortcuts on-screen as a kind of instant tutorial. I remember my physics major friends in college thinking it was pure snobbery for vi not to do that by default. Back then we were dialing in to an HP-UX server and using pico, which nano is an open-source clone of. For those who aren't aware, pico was originally the editor component of the Pine email client.
Absolutely, the shortcut help is so useful!
I believe that Nano and Pico copied it from Wordstar.
> physics major friends in college thinking it was pure snobbery for vi
I don't think it is snobbery, that approach would clutter the entire screen. Basically every single small/capital letter and symbol has a function in vim.