Back in 2017, I bought a new stereo for my project car. I made sure that it supported Android Open Accessory, so that I'd be able to stream high quality audio

Back in 2017, I bought a new stereo for my project car. I made sure that it supported Android Open Accessory, so that I'd be able to stream high quality audio over USB. By the time I installed it, it didn't work. Why? Because Google deprecated AOA in Android 8.0, in August 2017. AOA support was removed and USB Audio UAC1 & UAC2 were added. This left existing owners of car stereos produced from 2011 (when AOA was introduced with Android 3.1) on. This also created a problem in that no car stereo manufacturer seems to have implemented UAC1 or UAC2 support, likely because it treats the stereo as a 'dumb' DAC, so you can't control playback using buttons on the stereo. So, why did they remove AOA? My only guess is that it was done in order to push Android Auto. I believe that Google will just screw over existing users at the drop of a hat if a brand manager decides it might increase some market share metric.