Because doesn't need relays, it's transmitted P2P, the only problem i see is not having global feed to find new peers to connect

In Rostra users "follow" (subscribe) to other identities like in many conventional social network systems. Followers track, download and help share data of users they follow.

You don't need to leave nostr, you can use both.

I think it would be interesting if nostr data could be transmitted P2P instead of with a relay system