"Pretenders don't quite understand that design is born of constraints. Real-life constraints, be they tangible or cognitive: Battery-life impacts every other aspect of the iPhone design - hardware and software alike. Screen resolution affects font, icon and UI design. The thickness of a fingertip limits direct, gestural manipulation of on-screen objects. Lack of a physical keyboard and WIMP controls create an unfamiliar mental map of the device. The iPhone design is a bet that solutions to constraints like these can be seamlessly molded into a unified product that will sell. Not a concept. Not a vision. A product that sells."
From "Why Apple doesn’t do “Concept Products"
