Plex pass makes it worth it for me with the native app on my LG CX OLED - if JellyFin could crack that I'd look to switch in a heartbeat.
In-house it doesn't do any transcoding to the TV's, only to mobile devices and off-network.
Blu-rays with Atmos use TrueHD Atmos, while streaming Atmos only supports Dolby Digital Atmos. Infuse does not support TrueHD Atmos, and there is no way to switch between the two, so giving up Atmos for the base 5.1 or 7.1 is your only option.
Similar case with Dolby Vision. Blu-rays use Profile 7, Apple TV only supports Profiles 5 and 8.4. So no actual Dolby Vision streams for you, just HDR10.
Current status LG QA is testing it and if it passes should be available in the LG Content Store soon after that.