Mike Dilger ☑️ on Nostr: Right. Well in a certain context that might be useful. But Mosaic is essentially ...

Right. Well in a certain context that might be useful. But Mosaic is essentially nostr on steroids without major architectural change. It is still a client-server protocol and there is no gossip between servers. Basically I'm just taking all the things that I didn't like in nostr, or that we can't easily do in nostr, and trying to do them in a new way.
But I'm not going so far as to design something with a gossip protocol. No broadcasts, no routing, nothing like that.

So Mosaic is a way to find and download a subset of a person's social media content, like "what has Mike posted today". It finds where those posts are, selects just the ones you care about, and downloads them.

Other protocols could do other things outside of Mosaic.