Understood. Philosophical matters aside, Poweramp is a great audio player for Android (and no-doubt other platforms) with premium features that appeal convenience-users and audiophiles alike. I prefer the interface and functionality of Poweramp to two of it's closest competitors installed on my phone (at roughly the same cost for full-featured versions). Yet both of those apps proport to transmit audio via Wi-Fi per AA system design standards. Importantly, a few friends and family members (non-audiophiles all) have distinguished a sound quality difference between BT and wideband audio when staged through my 2018 run-of the mill Kia AV system. Evaluations were conducted in a powered-up but non-moving vehicle, admittedly, but they were legitimately blind A-B comparisons (audio transmission method was not revealed beforehand).
In the end, I believe Poweramp may actually BE capable of fully exploiting AAWireless. Why? There is a noticeable difference in sound quality when I switch headunit modes between AA and BT (DSP and volume settings normalized). Additionally, an XDA developer suggests all data presented to the USB port (with or without the AA wireless dongle) looks exactly the same to the A/V headunit. If that's true, Poweramp audio routing information could be improved for greater accuracy - the gist of my original inquiry. Either way, operational details shouldn't remain a mystery...