I don't know about in the past, but what I'm trying to say is that it is an actual exclusive mode--the behavior is exactly as you describe with Qobuz. And, at least to my ears, there's a distinct difference in sound quality between exclusive mode and non-exclusive mode.

I can confirm that this is the case. I use Amazon Music HD, mostly for financial reasons and because Echo Dot is the easiest way to let my kids stream music in their rooms. I have my MMB2 set up in Windows to be at 24/192, and Amazon Music plays each track at whatever its highest bit depth and...