Most of the time this is a good default approach. But sometimes animation can help to improve accessibility (e.g. when motion or a brief change in emphasis help

Most of the time this is a good default approach. But sometimes animation can help to improve accessibility (e.g. when motion or a brief change in emphasis helps convey a state change that may be less noticeable without it). This is where reduced is an important distinction. For cases where animation is helpful but the user prefers reduced motion, the animation’s duration can be reduced and/or the animated property changes can be subtler.