I don’t think there is anything, really.

Radarr and Sonarr work because the naming conventions for videos are more or less established.

With music, everyone has a different philosophy for tagging, renaming files, transcoding, how to handle best-of albums, compilations, etc. So what works for you probably doesn’t work for me and vice versa.

Lidarr gets very few updates, I don’t think anyone is working on it anymore. I remember the problem was keeping up with metadata handling.