Jellyfin is great but has some issues that can make it annoying. The 3rd party clients are often better than the normal interface. The server is easy to set up. So I can recommend all of it.
Honestly though, just because it isn’t updated doesn’t mean it is not great. I always revert to Clementine myself. Still use it daily and love it. There is an updated variant called strawberry which is updated and works great, but the remote doesn’t work.
I can confirm and I do use this feature of jellyfin. It works great. The reader is unusable. I use Librera for reading. It’s great, free, and open source.
So my flow is biblio, mam, library Genesis, Anna’s. Then to jellyfin folder that it reads automatically. Then I can download that to any device connected to the jellyfin server. Local is easy, abroad through tailscale.