The undo history in Figma is pretty weak. My dream would be an unlimited undo history that is available between sessions. I could close Figma, and re-open it, and my undos would still be available. I could step back a file all the way to it’s brand-new blank state even if it’s a 3-year-old file with millions of actions.

At a minimum just increase the undo history by like 10x and I’d probably be happy. But the eternal undo history would be MONEY.