If everybody would learn to voice-control their smart phones and receive 3x speed audio feedback, battery life would shoot through the roof, since illuminating

If everybody would learn to voice-control their smart phones and receive 3x speed audio feedback, battery life would shoot through the roof, since illuminating the screen is so costly, and you'd never need to do it. Blind people use smartphones this way, so it's not as though the device can't support it. And it would encourage all websites to be accessible, content-only, no-image sites, and they'd be no-javascript as well. Problem solved.