You have to consider hardware limitations, you want maximum battery (thus minimize power burn, by reducing CPU and GPU load), and that can only be achieved by o

You have to consider hardware limitations, you want maximum battery (thus minimize power burn, by reducing CPU and GPU load), and that can only be achieved by optimizing for the highest possible speed. Battery life is everything, no one cares about electricity bills on a laptop or phone, but they do care if the phone or laptop dies sooner than it has to.