It works on Android with an app and Windows in the browser. That being said, the subpar experience part is definitely something I agree with, and come to think of it, if I used Windows I probably wouldn't use Apple Music either.
Might’ve been, but I think I recall it took them a couple of months.
Anyway, another factor in the decision could be that aside from Tidal, Apple Music pays the most to the actual artists per stream. Almost twice what Spotify pays, I believe.
EDIT: I'm pretty sure iTunes for Windows has Apple Music support actually: https://support.apple.com/en-us/HT210384