Undo is not available until some time after input. The experience is terrible

You can undo, redo, or repeat many actions in Microsoft Word, PowerPoint, and Excel. You can undo changes, even after you have saved, and then save again, as long as you are within the undo limits (By default Office saves the last 100 undoable actions).

To undo an action press Ctrl+Z.
If you prefer your mouse, click Undo on the Quick Access Toolbar. You can press Undo (or CTRL+Z) repeatedly if you want to undo multiple steps.
You can't undo some actions, such as clicking commands on the File tab or saving a file. If you can't undo an action, the Undo command changes to Can't Undo.
To undo several actions at the same time, click the arrow next to Undo Undo button , select the actions in the list that you want to undo, and then click the list.

To redo something you've undone, press Ctrl+Y or F4. (If F4 doesn't seem to work, you may need to press the F-Lock key or Fn Key, then F4).
If you prefer to use the mouse, click Redo on the Quick Access toolbar. (The Redo button only appears after you've undone an action.)

To repeat something simple, such as a paste operation, press Ctrl+Y or F4 (If F4 doesn't seem to work, you may need to press the F-Lock key or Fn Key, then F4).
If you prefer to use the mouse, click Repeat on the Quick Access Toolbar.

Hope this helps.
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Please, it is so important

Would also love to see this!

still missing... why?

I can't use this app without undo. It is a no-brainer

Except for the Undo/Redo missing, this App is almost perfect.

Very unfortunate that this very basic functionality is missing.

Yes, it is really frustrating to lose time deleting accidentally one element and not being able to recover it.

where is this feature... it R E A L L Y sucks w/out it..

Needs undo of some kind on windows 10.

Cannot agree more...

Agree with that, this is really a key functionality that is missing !
All the more since the rest of the app is really great :)