If you're only interested in topics then switching from another social network to fediverse isn't so bad. But a lot of the twitter userbase is there because they want to follow people not topics. If you're into journalism all the journalists are there. If you're in the art world all the artists are there. Prior to musk it was easy to know that you were following who you thought you were. And the value is in that group of people all being there.

It's like how it's not a big deal for me that I quit reddit to come here, but I still have to maintain a Facebook and LinkedIn presence for my career. I can't (yet, anyways) tell people I meet at conferences to look me up on fediverse and then have to explain what that is and how it works and make sure they follow the right account name from the right instance.