IIRC a lot of PC SSDS nowadays have more than two priority levels. We don't know how many priority levels MS has with XvA; people assume two becuse of Cerny's mention of PCs using two priority levels for their SSDs. However if a limited number of priority levels were a hindrance with PC I/O and MS are well aware of that in designing DirectStorage and other parts of XvA, they would obviously increase amount of priority level support.
So I'd expect a minimum of 4, but it could be more than that.
They aren't dreams, it's common sense. I know what side of the fence you play on (so to speak) but I think sometimes you let that get in the way of considering rational approaches if they aren't on your side of the fence, if you catch my drift. That's a shame, too, because you have good insights aside from that.
Dolby settled on 32 sound sources as they figured it was more than sufficient for what the average person would be able to distinguish. Seeing as how they've been at the forefront of a lot of audio standards for decades, I'd trust their input on that. Sony could simply be overkilling with Tempest, we will see. I don't expect most games in practice to require that level of sound sources, honestly.
I'd invite you to consider things more rationally here.