[WorldMaker]

The new apps seem to take more advantage of the open source collaborated cross-platform version of Foundation rewritten in Swift that uses as much of Windows' WinUI and other native libraries as it can get away with (via more direct WinRT/Swift bindings), much thinner than the Objective-C Foundation the old iTunes was built on that used very few Windows native libraries. The apps themselves are still closed source so we don't know for sure, but overall they seem less bloated and more "Windows native" than the old iTunes, while apparently still sharing a lot of Swift code with their Apple platform relatives.

It's a fascinating new version of the old stack that works much better on Windows, if those things are true. At least in my usage so far, the Apple Music and Apple TV apps feel much better on Windows than iTunes ever has.