After looking at this list I’d like to pre-qualify what I’m about to say: I have jellyfin and like it, I use jellyfin regularly. I have it pointed to the same catalog as Plex and if Plex ever gets thoroughly enshitified I will leave it for jellyfin
The biggest things I’ve seen (in decreasing order of pain):
transcoding can fail on media that Plex has no problems with
Jellyfin is significantly worse at detecting names and properly assigning metadata. Jellyfin does not have the same ease of fixing that when it happens that Plex has.
I’m not going to go through all the work to reverse proxy it. Nor do I trust opening it to the internet. So for her to access it outside the house she’s going to be using tailscale. Kind of just extra steps for the sake of extra steps.
Finamp is a poor replacement for Plexamp, Don’t get me wrong I love the fan project but it’s not anywhere near as good, and it becomes quite painful to use on large audio catalogs.
The Roku client doesn’t have any method to mark things as watched or unwatched or modified playlisted items.
I dislike the sections being static one row high and then having to rotate left and right through multiple things when they could just wrap.
I am super amazed that the project runs as well as it does. It’s a monumental piece of open source work, but there’s a lot of polish problems and I’m not qualified to help them fix them.
Edit: oh and I really really miss these skip intro Skip credits option that Plex has.