Interesting article speculating on Apple's corporate structure. goes towards explaining why Apple, as big and rich as it is, can't seem to juggle more than two balls at a time (and one of them is always the iPhone).
http://www.vox.com/new-money/2016/11/27/13706776/apple-functional-divisional
http://www.vox.com/new-money/2016/11/27/13706776/apple-functional-divisional