The iMac case went from white plastic to aluminum and glass, and the iPhone went from aluminum and glass to black plastic. Or white plastic to show off you got a premium 16GB version, just like the high-end MacBook is only in black.
None of that is coincidence. As technical advances slow and feature creep becomes more of a crawl, electronics is shifting from being all about the speeds and feeds and becoming more about the fashions and faux-pas.
Apple knows this and a new study shows consumers are driving it: