Jellyfin has spent years becoming the media server I recommend when someone wants control without another subscription or someone else’s cloud in the middle. That also means an upgrade matters a lot more once the server has years of metadata, plugins, users, and small decisions built into it. Jellyfin 12 is likely to make some of those installations complain, and a few may need actual repairs before they behave again. I don’t love that prospect, but I think Jellyfin has reached the point where occasionally requiring us to maintain the server is healthier than pretending every old configuration will keep working forever.