There's nothing more frustrating than when you type the word you want to type, it changes it to a different word, you delete it and type the word you wanted to type again and then rinse/repeat 3 to 4 times before you have the word you actually wanted.

And if you're not paying attention, your message ends up looking like you're having a stroke.

It used to be that if you typed, deleted the correction, and retyped, that spelling would now be the preferred and you wouldn’t have to play that game anymore. Apple broke that years ago.