Couldn't you just extrapolate the same reasons people say living in urban areas is more efficient than rural?
It seems trivial to see that storing all the music in 1 or more DCs for the entire world is more efficient than a whole industry to create and redistribute plastics and specialized devices to play this plastic.
It seems trivial to see that storing all the music in 1 or more DCs for the entire world is more efficient than a whole industry to create and redistribute plastics and specialized devices to play this plastic.