Sorry, you're absolutely right.
I have a Servarr stack with Jellyfin which I'm using with Kodi.
It runs in docker on an old PC, using an elderly NVIDIA GPU for transcoding.
I was trying to use my RockPi as the TV-end of this arrangement- it talks CEC and is generally a better fit- but I can't get viable audio out of it with LE, and nobody else makes a recent distro that will even boot properly on a 4b+ anymore, not even armbian.
I saw that Kodi isn't being properly packaged anymore, so I installed LibreELEC on the old PC, installed the Docker add-on, and ran up my Servarr stack on it.
The only missing piece now is the ability for the Jellyfin container to access the GPU.
The NVIDIA container toolkit is the glue that lets docker containers use the GPU for things other than drawing on the screen.