And yeah, it's terrible. Apple doesn't make good apps anymore.
(This is part of why I think electron does so well -- it's not as good as a really good native app [e.g. Sublime Text], but it's way better than the sort of default whatever you'll get doing native. You get a lot of niceness that's built into the web stack.)
Passwords works fine for me, Settings does display notorious lag loading icons, but Apple Music is by far the most disgustingly bad “native” app. Everything is slow on that one, everything takes ages to load, everything makes scrolling choke and stutter, everything even looks like a website crammed inside a desktop window, and to top it all off, the feature disparity between mobile and desktop is so large that you can still see remnants of iTunes floating around on desktop while still not being able to sync the entire condition-set of smart playlists between devices. It’s appalling.
But hey, Apple is a small company after all, they must lack the resources to make their once flagship service run decently on these powerful new chips.