I have Apple Music because of Siri and how it is implemented into products like the HomePod which we use nearly every day in the kitchen and bedroom when we are casually listening to music. It is also implemented into CarPlay with Siri (which both the wife and I use). The ease of use, the lyrics on the Apple TV (my wife is Polish, so she loves seeing the lyrics), and the price when bundled with other services we use is what keeps us using Apple Music.
I used Qobuz for a year or two (during Covid when I was home all the time), but mainly implemented it in with Audirvana and DLNA. My issue with Roon was its lack of DLNA support. I admit, I haven't looked at it lately, but on top of the fee for Roon and the devices I would need to buy to use Hi Res around the house, it just didn't make sense for the way we listen to music. Also, tying my music listening to another computer meant that I had to have that computer booted up and ready to go at all times. Just another layer I got tired of dealing with when I had Audirvana (still use it on occasion for local files). Nothing is worse than laying in bed and wanted to hear some music and realizing you forgot to reboot your computer after a 2 second power outage.
I do agree that Apple Music is not the best option for Wiim or for streaming because of Airplay's limits. Airplay is limited to 24/48 on Airplay 1 and compressed audio using an Airplay 2 app and an Airplay 2 receiver. It is one reason I wanted the Ultra because it is in arms length of my chair in my office and I can use the iPad to stream music to a topping DAC which is fed into the Ultra via a preamp (switcher). The upside to Airplay, though, is that with a Mac it works with all audio (not just music). Airplay 2 is very easy to use for multi-room audio with any source on the iOS device, as well. So, the shortfall is there for anyone using any audio app on an iPhone...not just Apple Music. I have a direct feed from my computer into the Wiim Ultra, so it doesn't affect my current use.
Personally, I also pay for Amazon Music. It actually IMO has the worst interface of all audio apps I have used....though, Tidal didn't work for me, either. However, I use AllMusic Guide to get the information I want on albums when I want to dig deeper. Roon is actually overkill for my needs, but I do think it offers the best use of metadata on the market if that is needed for how one listens to music. Apple Music's algorythims combined with All Music give me plenty of music options and Amazon gives me Hi Res streaming and voice control with the Wiim devices I have around the home. Perfectly happy without needing a computer involved in my audio.