True it's a hot piece of garbage. Enshittification is probably a better word.
But it is a company and I am glad that there is serious competition from Jellyfin. It isn't a publicly traded company, so pressure from an open source product can push it to be better and not necessarily turn it in to a money grab that makes the product shit. They've made some missteps the community hasn't liked, but they have also had improvements as well.
This kind of black/white thinking is harmful. Plex "just works" for the family I share it with, I have zero interest in being 24/7 tech support so I don't use things like Jellyfin. If this UI/UX improves enough then I might consider it but everyone I've shared my Plex with has been able to use it without peppering me with 100 questions. I seriously doubt the same would be true for Jellyfin.
Xsteve, tvheadend and stream River are options