Because they're the thing in your life that you have the least control over. Businesses and governments can lower all kinds of costs by using your phone to manage you. If kings had the ability to distribute smartphones when feudalism was in full swing, feudalism never would have ended.
They watch you while you watch them, and there's nothing you can do about it. What I really wonder is whether we're 10 years away from police being dispatched if your phone is turned off (which, of course, would have started as opt-in, and ended as getting a ticket for letting your battery die), if we're 50 years away, or if there will be some sort of Butlerian Jihad before it happens.
edit: we can pretend this is just about authentication, but the reason smartphones work for authentication is because you have no control over them. If you root your phone, it becomes useless for authentication.
They watch you while you watch them, and there's nothing you can do about it. What I really wonder is whether we're 10 years away from police being dispatched if your phone is turned off (which, of course, would have started as opt-in, and ended as getting a ticket for letting your battery die), if we're 50 years away, or if there will be some sort of Butlerian Jihad before it happens.
edit: we can pretend this is just about authentication, but the reason smartphones work for authentication is because you have no control over them. If you root your phone, it becomes useless for authentication.