The animations are useful when you can't easily see the instantaneous change, but I'm with you on the slowed feedback. I think the best feedback would be for th

The animations are useful when you can't easily see the instantaneous change, but I'm with you on the slowed feedback. I think the best feedback would be for the slider to move instantly, but with a fading motion blur effect. So if you're hard of seeing, or blink, or whatever and miss the change in state initially, there is still an animation playing that you can see to know that something changed, but at the same time the button is already at its new state, so you don't have to wait if you are paying attention. Or we can go back to normal checkboxes and radio buttons where the on/off state is obvious and no animation is necessary to help people see when they change state.