As someone who prefers to own music and organize it how I want, this is incredibly disappointing. I have no doubt that Apple Music will include only a fraction of the features I've come to depend on.
How do you figure? Itunes is completely unaware of most qualities of music, in fact nearly everything unattested in metadata.
This is optional, there's a "let iTunes manage my music for me" checkbox somewhere.
Save yourself some disk space my friend.