Auto-correct that just fixes the mistake instead of giving me the red-line

Problem is, sometimes you want to use a non-standard spelling. Also, the AI may hallucinate a different word than you intended.

Both are solved by the delete button and to overwrite any new text that was previously part of a deletion?

May be more annoying than it's worth tho

I don't suppose you're familiar with the /r/DamnYouAutocorrect/ subreddit?

Mac OS does this I think iOS does this probably iPad OS does this.