Avid jellyfin user here:

Subtitles on jellyfin suck. Like really suck. Unless they are burned in with the media (maybe not the right term, but when they are shipped with the media as a track which some private trackers require) , they progressively get more and more out of sync to a plateau and get messed up with tracking. Almost every release this year has a “fix” for. Multiple clients with the same behavior. Not to mention getting hardware accelerated transcoding working on an ARC GPU 😅

But overall Jellyfin is damn great. It just is not quite to the refinement of Netflix, which is fine! It isn’t commercially backed luckily, so it won’t go to shit for money like Netflix did either.