The outbox model is great for user based note aggregation, but it is absolutely useless for topic based note aggregation. Personally, I very rarely care what users my notes come from. What I care about is what topics the notes are about. I believe that being able to use relays with your values and relays supporting notes on a given topic is far more important than being able to find a relay that supports notes from a user you like.

I wouldn't count on "[N]otes and [O]ther [ST]uff over [R]elays" to transmit notes in other ways. I believe the direction Nostr needs to go is toward relay auditing and transparency. Unfortunately I haven't heard anyone else advocating for this. I don't believe that self sovereignty advocates on Nostr fully understand the assignment here.