But why do we need “smart” watches or face-mounted computers like Google Glass? They have radically different hardware and software needs than smartphones, yet they don’t offer much more utility. They’re also always with you, but not significantly more than smartphones. They come with major costs in fashion and creepiness. They’re yet more devices that need to be bought, learned, maintained, and charged every night. Most fatally, nearly everything they do that has mass appeal and real-world utility can be done by a smartphone well enough or better. And if we’ve learned anything in the consumer-tech business, it’s that “good enough” usually wins.
Marco Ament – Smart watches and computers on your face