So you are a creator excited about nostr. You start using app A and like it, and you want your fans to join. You recommend app A and they start using it. Then app A changes - bans, censors, prioritises features you don't like etc. You've spent your clout to promote an app that you no longer like. You can switch, but it's hard to persuade your followers. That may or may not be a big or common problem, we don't know yet. But outbox model doesn't solve it. "Apps are interoperable" lowers the bar for switching, but it remains to be seen for how much. Does this make no sense?