There are a number of reasons why I'm not excited about Mastodon like I am about Bluesky. Various Mastodon features don't work well. For example:
Bluesky doesn't have these issues. All servers, feed, and content can be viewed from a single UI that simply works.
They're working on a feature to export your profile to other servers (without disrupting your followers or content, maybe only your username).
Bluesky usernames can be changed any time!
Mastodon requires migrating your account to a new server to change your username, and then your experience gets even more discombobulated.
I am really enjoying Bluesky.