This can be done today in a theme component if one wishes. I know 100% that @codinghorror would be 100% against, by default, popping up a JIT every time an admin hits the delete button.
A JIT on every delete would heavily discourage admins and mods from pruning the garden cause there is constant added friction.
Pop the composer filled with a DM to the person, official warning = yes.
(obviously the post itself would have a red background too from the moderator just now deleting it, I don’t have a test instance anymore to use for this!)
I also think that this added friction is not necessary and neither does it make sure that people get notified. There should be friction for not sending a notification, not the other way around.