It creates that "one big chatroom" vibe from old twitter, while Mastodon feels like a bunch of people microblogging next to each other

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.

People just join it thinking it's Jack Dorsey's next twitter.

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).

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.

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

More non political stuff most likely.

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