My point is that we still don't know exactly what's the right approach and we shouldn't make a detailed guideline of how to implement it because we want different ideas

perhaps what would be cool is, for the people that have implemented it (Gossip, Coracle, NDK, Snort), to do a panel or something and discuss lessons learned or something like that because there's a whole lot more than just looking for NIP-65 events when it comes to implementing outbox model (i.e. answering the question "what relays should I read/write for X event/pubkey/tag")