> Double points if I backspace to change it back and it re-"corrects" me again.

That's just awful design. Another quirk is that it can autocorrect the last word you typed when you press "send". Sometimes I proofread myself and still end up bitten by the autocorrect because it changed something when I pressed "send".

On Android when you backspace once after an autocorrect it reverts the autocorrect. It's not great but still better than what iOS does.