Ok so Elan. Even if not documented Iāll take that as official API.
Is there something I can do on my end to test if this solves the issue? Or would I have to wait for an official update?
You need to wait and wait and wait 
Hey Tolriq,
Just wanted to let you know, I am still inquiring on Plex about improving this with Symfonium. My most recent question was regarding having the Plex server-side loudness leveling data passed on to Symfonium somehow, so I (and then others) donāt have to apply ReplayGain tags to everything. I am not sure if this is something you have considered. Here was Elanās response:
āAlbum-level gains are passed in the XML/JSON responses from the server. AFAIK they are included by default.ā
Let me know if thereās anything specific you want me to inquire about, if you think this easier method (for the user) of loudness levelling could be somehow implemented into Symfonium.
Thereās nothing more as said the other side of is on Exoplayer side.
Ah, thatās a bummer. Well, never know what developments might happen over the years. I have almost everything I want to have downloaded tagged now at least, lol!