I thought Jony was off designing the spaceship and left his underlings to design the products the past couple years. Apple made a point of saying he's back now.
Without delving too much into Apple Kremlinology, while all product design is a team effort, Jony Ive was always the head and face of Apple's. He and his underlings have a shared perspective and culture, and the corner issue brings to mind an earlier example:
During the development of the first iPhone, Ive and his team became enamored with the look of an extruded aluminum prototype. Even though it was immediately apparent that the model's sharp edges made it physically painful to use as a phone, they persisted in trying to push the design and paper over its principal practical problems. It took Steve Jobs to finally step in, point out the obvious, and check Jony Ive's worst tendencies. [0]
Steve Jobs is gone, and nobody is left to fulfill his roles.