Playing the devils advocate here for a min - but if the user cares so much for “feel-good deletion”, why not use a client that supports that and let other clients do as they please? 

“You can delete on nos.social!” 😂 

 Btw I’m in support of delete. 

 In this case we need apps to say “our app does not support deleting content but other nostr apps do” rather than just “delete is not a feature we support”.