> I am perfectly capable of expressing myself if HN's software allows me to misspell…

This isn't about "promoting bad spelling"; we aren't talking about "misspelled 'bad' words don't get autocorrected". We're talking about a system where you try to type a "bad" word and the system substitutes a "good" word unless/until you override it. Or a system where you effectively choose every word from a menu, and the "bad" words are hidden using UI "dark patterns".