I assumed it was just me getting worse at typing but combined with aggressively wrong autocorrect and mysterious blue lines under everything I type they seem to have ruined yet another perfectly good UX.
Yeah, the blue lines under a random word in a perfectly correct sentence is such a waste of time ... did I mistype? Nope.
Yeah, the blue lines under a random word in a perfectly correct sentence is such a waste of time ... did I mistype? Nope.