Often when I wanted to research a niche technical topic I would search for it on Twitter, or tweet about it and see who in my network knew more. Often I would see individuals with niche followings say incredibly insightful or valuable stuff years before other people were saying it. I also had a bunch of professional connections form on Twitter along with many job opportunities I could have pursued.
Now I view X as having destroyed nearly all of that. The system is so setup to reward rage-bait and slop that even if I try to curate my experience for it the meaningful individuals get drowned out. The algorithm and all the actions taken on the website seem more about creating a social manipulation machine for Musk than enriching its users, and as a result many of the most thoughtful and valuable people have scattered away from the platform.
I'm all for diversity of thought, but X under Musk is about non-transparent algorithmic manipulation of speech and manipulating emergent behavior to achieve political goals. It is one thing to unban people, but it's another thing to intentionally break all tools (like ban lists) that enable people to self moderate. Musk's X amplifies certain speech and then disempowers people who try to attain higher quality more productive discourse.