TBH, outlook hotkeys generally are a mess like that - not even when compared with their "competitors", but also when compared with Windows itself. I can't even tell how many times I wanted to search for text in a long email only to find that "Ctrl+F" forwards the open email.

Press delete accidentally or intentionally and you should see a notification about the delete.

If you want to undo, then Ctr + Z. At least that's the way computers have worked for eons.

Ctr + Z is the reason I prefer computers to typewriters. Software without the ability to undo or reset actions are devolving the user experience to typewriter age.