the button I want most in my Typing English career: a "yes that's misspelled, correct it to the first suggestion" button.

having to switch to a mouse to click on the spellchecking for every minor word is so tedious

@foone This isn't a suggestion (or even a solution) but at some point I figured out how to make neovim jump to the next misspelling, show the default correction, and with one keystroke correct-and-jump to the next misspelling.
I loved it, but as with so many neovim features, haven't needed it enough to remember how it works.