So I have been doing this since yesterday - using my US ID - the sources were (as I have since circled back to my regular use ID) iPOD Touch 2019 and 2020 iPad Pro with AQ Cobalt as the DAC, playback using AL6000a with Quad S1 speakers and a Focal Cub2 Sub with a Mediabridge RCA to 3.5mm cable and my IEMs - Westone UM3X and Etymotic ER4XR. I also re-activated my Tidal membership for the test and did a side by side with some Local Hi-Res files I have. The songs were the ones that I know very very well from the following genres - Classic and Hard Rock, Alternate Rock, Jazz, Classical and Electronic, some R&B/Soul, some vocal centric music.
I personally feel something has changed for sure, from their regular offering of the same music, but I am not sure if it is for the better. The songs I have on Local definitely beat both Tidal and Apple, but they beat Apple by a very fine margin. The details using the ER4XR is the dead giveaway, there I can hear some very specific things that are clearly superior on the local RIPs and on UM3X (my current and forever reference) though the differences are not night and day, but the Local RIPs feel superior. The UM3X's fun yet kind of analytical character makes my Local files a lot more enjoyable. Tidal in comparison to Apple Music also sound much better - cleaner. Apple Music is very lifeless - not sure how to explain.
The only difference I see is that Apple Music files are a fair bit louder at the same volume from the sources. The volume of the playing program - Apple Music, Tidal and JetAudio was set at 100% and the sources were kept at 35% (I am not SPL crazy) - that could be the reason for loudness difference though.
Also I am not sure if the JetAudio was natively playing my local files at full hi-res so take that with a pinch of salt. However most of the testing was done on Apple Music and Tidal, the local was just for reference. Also my methodology is not very scientific so do not take it as the final word.
I never had much hope from Apple Music, hence I didn't want to go thru this pain, but I have my answers now, I am still waiting and will wait for Spotify Lossless, they have spent so much time on this that I am hoping they are doing something good - "HOPING". Regardless, if they fail too, I will learn to live with the regular Spotify. Time to save money and get me some Philips earphone and creative speakers. Life will be much much simpler.