Im not sure I agree with this, and its quite a common argument for animations in UIs. The fundamental weakness in this argument is that animations are not interactive. They have a beginning, middle and end. Any attempt to interact with the UI during this sequence would disrupt the animation. This is why animation makes UIs feel slow; clicking the widgets requires a period of time to transition from state A to state B via animation. The irony is that this is used to indicate a transition, to emulate what happens “in the real world sliders dont teleport to the next state”, but this often always misses the fact that I didnt slide the slider to its new state: i clicked a mouse button. That is an immediate state transition. So all animations like the above do is slow the feedback of the state transition in a misguided attempt to emulate a real world slider when i never interacted with the UI in any way that resembles a slider.
This is why we design animations in immediate actions to be below 100ms, any more than that and we start to feel "computer's reaction is slow maybe it's doing some calculations in the background?"
100ms is more than enough to break the joyful feeling of the computer becoming part of my own body, like a hand tool or a bicycle. Humans are adapted to tool use, and don't need to consciously think of the position of tools they're using. But this effect only works if the tool moves like an ordinary physical object. If you move a pencil, it just moves. It doesn't move and then move again because a designer wanted to play an additional animation after your movement. Until we have direct neural interfaces, all UI animation playback is unrealistic, because it's adding to the physical movement of your fingers, not replacing it.
