Aside from high-res streaming, another reason for RoPieee support is for us to join multiple speakers in a room with the airs with balanced sound (for surround/imaging). TL;DR Roon only runs its multi-speaker adjustments on RAAT devices like Pis-with-RoPieee, not with Airplay.
https://kb.roonlabs.com/DSP_Engine:_Disabled_During_Zone_Grouping
As a workaround, if I could collect and adjust my AA-enabled speakers as a 'virtual multichannel' unit with the air software, making DSP adjustments there including L/R separation, and then present that as a single selection to Roon, I could get the benefit of multi-speaker placement; otherwise I defeat a major purpose of running multiple speakers in a room.
