@cereal_killer I think you are way off base here…
Who? As far as I see it, most of them are RoonReady/RoonTested and a handful left in active development.
You are calling 96/24 “low-fi at best”. This is ridiculous.
But I’ll go with it for a second, and ask again: Who in the super high end is sticking to UPnP? I think you are building up a false idea here… answer the question: who in the “super high-end” (or even the not-super but still high-end) is sticking to UPnP or some other non-RAAT alternative? I claim it is no one, and that UPnP is a dead man walking. Prove me wrong with just a few examples … you seem to be confident the market is full of them.