That, or everyone knows and accepts the consistent and polished apple design.

Who needs all of the garishness most PC makers put into their designs? Most of them are butt ugly, or poorly conceived. And the ones that try to ape Apple's designs make just enough modifications to avoid legal issues ... and to dilute/ruin the value of the clean design.

If there's one thing Apple _does_ know, and consistently get right (at least, since Jobs' return), it's physical design of their devices. They don't always get the materials right for constructing the design, but they get the designs right.