I did choose to not use other standards as the main features of Meelo (multiple album/song versions, getting B-Sides, etc.) are not supported by them.
The server's API follows its own design.
It makes sense, since Meelo's main strength is the rich metadata model. You'd have to butcher it into a lowest-common-denominator format, which in many of these subtle cases would be missing the entire point.
I think people who would rather use streaming apps should just stick to Jellyfin or Navidrome.
I still prefer to listen to music through a native/dedicated app on desktop (and definitely on mobile). As much as I don't like Electron, Cider went with it and it's not that bad.