My biggest gripe is the sometimes hilariously strange behavior picking artwork:
https://github.com/jellyfin/jellyfin/issues/10494
Other weird things I have been able to DIY. I wrote my own auto-updater and Live TV listing grabber.
You can use Ersatztv to create an automatically updated playlist, based on a Trakt or IMDB list. Back in the day, there was/is a a cool addon for Kodi called “PseudoLiveTV” and these apps replicate this functionality.
So you can have an always updated Christopher Nolan collection, Halloween movies, westerns, 24/7 90s cartoons, BBC nature documentaries or whatever.
You can pull any imaginable tv or movie list from Kometa using Ersatztv:
See here for one idea: https://youtu.be/Ibaj6NiS8xM?si=eiPhTzZuwGAwa8Id
So I am literally streaming ATSC channels from my roof antenna with JellyFin. I didn't feel like paying a subscription fee (and anyways - no paid service has exactly the right XMLTV format JellyFin expects), so I wrote a scheduled task which scrapes the listings and ingests them with the REST API.