OP here. Definitely! Both of those are important too, SSB especially, it's been around for so long. Plus Rabble has been vocal in fediverse and Bluesky development and now actively building Nostr stuff.
(And I'm actually all for multiple protocols, especially right now when we're still fairly early in the space's mainstream growth. Much better to experiment with lots of different ideas now while we still have a bit of breathing room!)
Have you looked into Farcaster's or Secure Scuttlebutt protocols too?