The most common argument I see is the lack of recommended content. Mastodon only shows you what you want to see and if you don’t actively follow accounts and hashtags, your feed can seem empty. That’s a massive difference to the birdsite. Quitting algorithms cold turkey is too much for some. They probably hope Bluesky is a middle ground.
I use it for about a year new. There are a few hiccups now and then, but you can just switch instance. That’s why I recommend using Libredirect with it. If you have trouble with an instance just ping the instances in Libredirect and chose a new one. Backup your preferences from the old instance and import it to the new. Your settings and subscriptions are available again.
Will they actually manage to put all options in a single menu this time? Because it’s hilarious that I have to use Options and the a Control Panel in Win11