If you go on Bluesky they will tell you. Lots of people saying that they feel isolated because there is no algorithm feeding engagement, and federation doesn't lend itself to finding your friends from Twitter easily without one of those migration tools people were using. Then another chunk describe Mastodon users as a "HOA" because someone told them to put a CW on something.

I think emulating twitter was a huge mistake for mastadon, the twitter reply structure that makes it difficult to have a long conversation with multiple people to be the main part of the post but ideal for "dunks" and outrage farming. I think the Tumblr reblog structure would have been an infinitly better choice for the more actual socialising thing fediverse is going for and a small user base that isnt producing much content and can re-circulate older posts. also it's less image-centric allowing more posts to be stored on a server, additionally (intuitively, I haven't thought about implementation that hard) it seems like a much more natural fit for federation.

As much as people may not like to hear it Ease of use from being one centralized platform is a big factor

Just login and be done with it

People are happy to peddle incorrect information which is easy to find. Dorsey is on the board, but deleted his account and used Nostr and Twitter significantly more than he ever did bluesky. Cultural debt: Mastodon has the cultural debt of reply guys, FOSS bros, racism etc During the great migration a lot of minorities attempted the switch and were met with a lot of racism which was easy to hide due to PM. Mastodon also has the onboarding issues. Studies show most users are passive users of social media, they don’t want much friction just to lurk. Bluesky appealed to minorities particularly Black women very early in the process and that contributed to the growth and culture. They’ve lost some of the goodwill due to some moderation issues. But, without the cultural debt and without making decisions such as no full-text search (since changed) and no QTs, two features that benefits minorities and professionals alike turned off many. There’s also no current federation so the onboarding is simple and smooth. The culture on Mastodon based on 4 polls I’ve seen with 10k plus responses, Mastodon leans older than bluesky. Unlike what’s put out there bluesky doesn’t aim to be a Twitter replacement but more so Mastodon+. Lastly, the culture on Mastodon often takes itself too seriously while bluesky is mostly horny, crapposting, awareness raising and lots of laughs

Portable accounts and being able to add third party layers to your feed for moderation and sorting algorithms. At least that's their design goal, idk if it's actually implemented because I never got an invite after like half a year.

Main positive thing I’ve heard is that it has a different vibe and culture that some might find more open and fun and sometimes even less problematic. That’s just hearsay, I’m not on there, but I’ve heard it from people I like and trust (on masto).

Lots of semi naked dudes and I still don't know why!

Better posts. Feeds (like categories replacing hashtags) are great.

Billionaire backing.