Let me clarify my thought. Different email clients work differently, but perform the same base function for user - receive and sent emails. Everything else is nuances. Let's get back to Nostr. We have a pool of Twitter-like apps with basic functionality. I don't see any advantage in using different ones for the twitter-like experience, if one works well and is available on different platforms. I liked your idea that this might be a relic of the old web. But the question of the benefits of use arose too quickly.