Steve Jobs is a man with impeccable taste, like a Vignelli with a bent for technology. The minutiae of Apple’s pipeline, products, and services have been subject to his stamp of approval for years. There is something cohesive about Apple across all levels of the company. That DNA is a reflection of Jobs’ personal style.
The impression I get is that Tim Cook doesn’t fulfill this role. My main concern for Apple is that they might not be able to keep up the current momentum without that singular, brilliant taste-maker. It is rather well established that matters of style are not well suited to board rooms.