Who is asking for spatial audio mixes? Is there any demand for this or is Apple pushing it for corporate reasons? To my ears, the spatial mixes are an interesting gimmick, but the audio quality sounds worse than the "HD" (or whatever they are called) mixes. Personally, I'm just happy with CD quality streams - I'm not able to hear differences with anything higher quality than that, but I can often (but not always) tell the difference with lower quality streams.