Lots of phones have really cool features but they're not widely adopted. Solid-state accelerometers were invented and then instantly adopted universally. Same f

Lots of phones have really cool features but they're not widely adopted. Solid-state accelerometers were invented and then instantly adopted universally. Same for compasses and GPS receivers. Many features I imagined would become universal simply haven't. Periscope zoom cameras, for example, or HDMI-out desktop modes. Other great features were created and then fell out of favor, like rear-mounted fingerprint readers and notification LEDs.