Okay, now that nostr:npub1zuuajd7u3sx8xu92yav9jwxpr839cs0kc3q6t56vd5u9q033xmhsk6c2uc has pulled this very interesting NIP-104 out of thin air, we need to converge on a single "standard" implementation and ask all clients to implement it as soon as possible. I think this is strategic, because DMs (and small group chats) are a glue factor for keeping friends and family on Nostr after we invite them, so for promoting real life conversations. It would be a shame if new users started trying new apps and found they couldn't see the history or, even worse, couldn't communicate with their contacts. They would go back to the usual messengers of the big-corp and we would lose an important battle, making it difficult to rebuild trust for a new attempt.
So, what's the next step?