I use it to prepare my mp3/music for my self-hosted Funkwhale. Such a nice combination and it is fun again to really _own_ music.
For me my big wish when I have time is create some kind of automated soulseek flow. Keeping my library up to date is a manual pain for now.
I pair Funkwhale with Snapcast-Mopidy-Iris stack, in case I want to have multi-room audio or listen to other sources, beyond my own library.