p2p is obviously ideal but fails in practice due to the nodes being offline problem and notes not loading. nostr is a really good store-and-forward network though with efficient set reconciliation (negentropy), so it has a lot of opportunities to take advantage of p2p. Just seems unlikely p2p will replace relays entirely due to its unreliability.

Outbox model is already tricky, p2p would be techniques that extend outbox to online peers. most likely for DM purposes though, not really microblogging content where many people are consuming at once. It may seem simple to just say “just switch to p2p and everything will be better”. But i don’t think it would actually work for microblogging