We’ve discussed making autocompletion more discoverable in a previous thread. It’s potentially just home bias because Jeremy/Mike/I don’t use always-on autocompletion, and I personally find some of the completion behaviors to be… wonky, like Atom’s accept-completion-on-Enter, which conflicts with the ability to type a completable thing at the end of a line. But, yeah - as it stands, I fear that a lot of people don’t know that Tab works, and we need better onboarding to make that clear.
Per bring-your-own-editor… it’d be an awesome dream, but, yeah - it’s a massive undertaking, especially because editors nowadays have pretty deep language integration and we’d have to either create a “just JavaScript” dialect of Observable to play nice, or write an Observable mode for n editors. Plus, of course, the whole syncing/file-access/etc idea.