The problem is, MS thinks they know better than you what you want, and even if they guess it 95% right (and they don't), the rest causes so much frustration that its not worth it for audience like HN.

Its pain point with Office products since 90s, a classic example from that era (and 2000s) is doing a single newline in Word and reformatting whole 100 page document into useless mess. If they would make a clear easy option to just turn it off with 1 button, same for grammar corrections, it would make life easier for everybody. But no, MS knows better...