good designs can be made better.
1) Apple knows that 'design' isn't the same thing as appearance
2) Excellent designs often can't be made better
3) It's very hard to improve on a design regardless
The 'drop the bezel' is an excellent case study in this. It ignores the function the bezel has in terms of perception (it's a break between the screen foreground and whatever is in the background), in terms of structure (it keeps the Mac from breaking, basically), and in terms of handling (you can move the screen easily without thinking about where you can and can't put your fingers).
The same applies to the call for 'no more aluminum because it's not distinctive'. This ignores aluminum's properties in terms of heat, strength, weight, appearance, the ability to machine it, how it feels in the hand, cost, and what it connotes.
This isn't being defensive, it's being capable of distinguishing between "I think I want X" and "X is a good idea for Apple".