You seem to be unaware that with a flip of a toggle Apple Music serves lossless to you.
a) Bit rate has improved from 256kbps to 320kbps.
b) It's a lossless path all the way to your Mac which encodes and streams AAC to your Airpod. There is no psychoacoustic treatment since obviously you use Airpods for tasks other than music which it would interfere with.
For me personally I have noticed a significant improvement with using lossless audio with my Airpods.