> I would abandon Plex completely, but I still haven't found a capable app to remotely stream the 2.5TB of music on my Synology.

If you use iOS, I'm beta-testing an iOS 26+ Plexamp alternative with ~500 Plex users which supports all media servers (Plex, Navidrome, Jellyfin, OpenSubsonic, etc.). It's not feature-complete, but is daily-driver worthy for common use cases. You can find more info and a TestFlight link here if that sounds interesting: https://www.reddit.com/r/plexamp/comments/1qel35s/new_invite...