I have never used an Apple product so can’t comment on the SQ. I have a thread here on Atmos music and posted a video where Steve Wilson states that when Apple began offering spatial audio the demand for mixes in Atmos went through the roof overnight. My system is setup for Atmos as well as 2 CH, 5.1, 7.1, Auro 3d, etc. Atmos doesn’t compete with two channel, its a companion, not a divorce. Where some music fans lose it is they think it is an either or proposition, either 2 ch or atmos. Atmos is backward compatible, you can listen to an atmos mix on headphones, 2 CH, 5.1, or 9.2.7, or whatever. I think that innovation moves the industry forward and like it or not, Atmos music is innovation. So for this reason I give Apple Music props. We have already moved from lossy to lossless (except spotify users) and some streaming services are doing "hirez". When you talk about hirez Tomlinson Holman (THX)made an interesting observation. He said:
"Any audio engineer confronted with the question, “what do you want to do with a higher bitrate?”; will always ask for more frequency range and more dynamic range because they don’t know what to do with more channels. "It’s a new paradigm." "Just to go to 192 KHz sampling rate to satisfy passing bats instead of human beings is pretty crazy, but adding channels is of very great value."
I still use the codec he developed at USC with Audyssey-DSX where the focus is wide channels, then height, and finally rear channels. When atmos came along with object based audio it kind of left the channel based approach behind. Well any way I give Apple props for championing spatial audio.