Like @rbstehno I was disappointed to find out that I could not stream Amazon music files to a UPNP renderer. I worked hard to get off of USB and that’s a deal breaker for me.
Yes that’s lame - but marginally excusable: AMHD is relatively new and doesn’t have much tenure yet out in the 3rd-party device/software environment, let alone the open-source audio ecosystem. But given Amazon-as-vampire-squid it’s hard to imagine any other approach other than one that benefits their businesses/services first. Short answer: don’t expect parity anytime soon with Tidal and Qobuz in support of the broader open-source audio community.
AMHD ’lying’ about HD is also lame. So are its feature and UX shortfalls. Simple example: no user-facing feature to create ’stations’ from artists. That problem was solved years ago by the competition - and has been missing from Amazon Music since at least 2014.
