Most interface animation is decoration that happens to move. Things fade up as you scroll because a library made that easy, and after the third section you have stopped seeing it.
The test I use is simple. Pause the transition halfway and ask what it is telling you. A panel sliding from the button that opened it tells you where the panel lives. A card fading in tells you nothing.
That test removes most of the motion in a typical product. What is left can then afford to be slower, heavier and more careful, because there is so little of it.
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