My least favourite “feature” of iOS now is shake-to-undo. I’ve never triggered it intentionally. It’s too weird of a thing to remember when I actually want to do it. It would also feel ridiculous even if I remembered it. The only times I trigger it, it’s by accident, and then I need to cancel it.
The one that bugs me sometimes is shake to send feedback, because the feedback form isn’t useful whenever I trigger it by accident. The funniest implementation is Microsoft Teams, where if you shake it pops up a feedback form that then says you can’t send feedback because it can only be sent via Mail.app, not Outlook (you know, the Microsoft email client that your IT department makes you use instead of Mail.app?).
On the contrary it's one of my favourite iOS features. If you're writing any volume of text on mobile it's super useful to undo accidental mistakes. Android just doesn't have undo at all and your text is gone. Probably would be better as a long press menu option though.
I actually use that quite frequently, because it’s often quicker than the equivalent text editing operations. You can turn it off in Settings > Accessibility > Touch > Shake to Undo.
