Do emacs users have the same issue? I know a lot of software comes with some keyboard shortcuts that are similar to emacs, but not all of them, and i don't know if there's a similar level of "i am stuck without my editor" feeling that emacs users get when they don't have all the shortcuts available.
For me, web forms are okay for up to a typical Hackernews comment's worth of text. More than that and it gets irritating.
And part of the appeal of macOS for me is that the UI toolkit uses an Emacs-compatible set of shortcuts. So it's generally not a terrible experience, although without the meta key, you don't get a lot.
In day-to-day textbox use, I miss: M-f/M-b/M-d/C-delete (word forward, word back, delete word forward, delete word back), and C-space/C-w/C-y (mark, cut, paste). I usually type them, realize they haven't worked, and shift over to the fallback strategy without too much annoyance.
Strangely C-t (transpose) is the thing I miss most.
https://github.com/zachcurry/emacs-anywhere https://github.com/cknadler/vim-anywhere
I still hate to be found in non-Emacs editor for any non-trivial amount of text editing (a few paragraphs), especially if it's some sort of structured text.
Note that there are browser plugins to have textareas filled in with your actual $EDITOR of choice.