Dan Moren, writing for Six Colors:

But there’s a bigger—well, I suppose you could call it philosophical—point here. As long as iTunes has been around, the expectation has been that the music in your library is yours. This is what I find off-putting about the My Music integration in the first place—it’s intermingling tracks I own with those that I’m merely leasing.

There was something a bit odd to me about adding tracks from Apple Music to my library, however I could never really put my finger on it. But I think Dan fould the exact reason it was bugging me — I don’t like the idea of mixing tracks I own with tracks I don’t inside of an application that I’ve grown used to having populated with music that was mine to keep. I’d much prefer to keep my streaming music and my purchased music separate.