Yes. The UI equivalent of automotive tail fins is expensive. That's the sole point of it.
At some point in the "near" future it'll be energetically a net positive to snap a pix on the cam, analyze the eye pupils and accelerometers and recent eyeball movements, and if you're not looking at that part of the screen, its not going to waste energy displaying it. Could even see this happening with backlighting. Watching other people use their phones is likely to get very distracting for 3rd parties.
At some point in the "near" future it'll be energetically a net positive to snap a pix on the cam, analyze the eye pupils and accelerometers and recent eyeball movements, and if you're not looking at that part of the screen, its not going to waste energy displaying it. Could even see this happening with backlighting. Watching other people use their phones is likely to get very distracting for 3rd parties.