As I just came out of a meeting with 16 people who use Apple devices daily and all assumed there's no undo, here's a tech* tip that a lot of people appear to need:
Undo on 🍎 iOs: Do a three-finger tap and you'll get a toolbar with undo, redo and copy functionality.
edit: yes you can also shake the device to undo. Apple is currently breaking that functionality. Anyhow, for an interesting experience try to shake your laptop and see what it does!