My theory is he and Jobs kept each other in check. Without that leash, I feel he faces no opposition in his designs, and that's led to some of the laughable issues you are seeing in Apple's newest products.
I can see that happening! It reminds me of when cars are designed. First there's a concept car, but it is completely unrealistic. It lacks government safety requirements or any of the regulatory stuff. Then the production model is down to earth. It seems that they are letting Ive put out the concept versions of the products! Like a MBP with no ports. While the design is nice, it provides no functionality.