It's not owned by Musk, which is what the average casual internet user is currently upset about with Twitter.

I mean, if ~~Twitter~~ X keeps changing like it is, there will be a whole bunch of differences

From a feature-functional perspective, sure, but it's not entirely true. The biggest differentiators for social media are rarely the core features, but the content and friends. There's a few specific groups that have slowly been migrating from Twitter and Mastodon there.

There's a couple of very famous people that have moved over and because the audience is smaller, they tend to engage with people more often.

You are right. In principle, the AT protocol is designed for federation. But at the moment, there is only one Bluesky instance that everyone is signing up on. This makes it effectively centralized like Twitter. It is mind-boggling that people are ignoring Mastodon for this.

Less fascists for one