There have been plenty of people who have expressed explicit distaste for it @fiatjaf @semisol @PABLOF7z @Cameri and probably more i’m forgetting. I think someone even tried to remove it as a nip if I remember correctly.
I thought Pablo was the one to propose it ¯\_(ツ)_/¯ I haven't followed the discussion but imagine the distaste boils down to the added complexity all while not being a perfect solution. If nostr were centralize, this wouldn't be a concern since we could shove key delegation down everyone's throats.
I didn't propose it, I was an advocate for it -- we even did a panel with @KeithMukai at Nostrica for it. The closer I got to it the more I realize it was a very problematic NIP. I think NIP-46 is the right way of doing "delegation" as it's equivalent to taking complexity offchain
I think revocation is needed, and more thinking on the spec