Well Plex is not 100% at fault for either of the issues really.
First, I should correct myself. They removed hardware acceleration for Intel iGPUs. Acceleration on NVidia is still there. Personally I see the iGPU acceleration as really where you want to be regardless as it’s taking place on the CPU you are already using for the general server – it’s “free” acceleration. Compare that to the additional power/cooling/noise of a graphics card. The removal was due to the difficulties in supporting it due to a lack of official support from Intel for BSD.
The Sonic Analysis issue is more complicated. Again it’s an issue of lack of official support from a third party. What’s interesting is this is a second version of “premium Plex Music Library features” and one reason the original feature set was dropped from PMS was – lack of support for FreeBSD (I seem to remember Elan personally using FreeBSD at the time, or something like that – he had skin in the game at the time)… anyway, It just feels very odd to me we moved away from that other set of Plex Pass music features to head in a new direction and let ourselves get mired in the same situation where we can’t have feature parity for all PMS platforms.