Notes don't matter if nobody sees them. Relays can't take away your notes but they can certainly curtail your reach if they're large enough, and I fear that specialized relays would augment this issue.
You see it on other Fediverse tech, where certain large instances control the most thriving communities for various topics. I think specialized relays would risk moving us backwards in that direction.
This isn't like mastodon tho. The notes can be streamed and moved at will. Your pubkey is not tied to one instance. If you wanted to provide an alternate relay team and also cover the topic somewhere else, it's easy to just stream from the first relay and have a new relay with a different team. Members can connect to both at once.
At the end of the day, I don't really get Twitter. It seems like a fundamentally broken social paradigm to me. I hope nostr can do better, create more chat use cases, and that's where it's good to have options for relays just like we have options for clients.
