Much less intuitive organization, more focus on Plex provided content rather than self hosted, features were removed, pretty much if you are thinking of a possible downgrade then they downgraded

Set up ease is highly variable. I spent hours of videos and guides and fiddling and couldn’t get it running on anything except the desktop it was installed on.

I spent hours and couldn’t get it to show up on any device except the desktop it was installed on so I think your mileage may vary.

Plex did an update that took the perfectly good UI and fucked it hard, removed features, and generally is shit

Because it’s easier, in a lot of people’s experience better, and has more users. Why wouldn’t people mention it?

It’s very bad

I spent hours trying to set up jellyfin to watch somewhere else in my home and despite doing all the guides I just couldn’t get it to work. Plex is just so much easier. It has hiccups and the new update is horrible (still holding out on updating) but it still works 9/10 times for me

Nice people are unwilling to do the things necessary to stop assholes. Nice people won’t berate them, most won’t call them out, etc etc.