Hint: Think about vestibular disorders specifically, and what kind of on-screen motion can actually trigger physical symptoms for people with that condition, not merely a matter of visual annoyance.

For people with certain vestibular disorders, conditions affecting the inner ear and balance system, excessive or intense on-screen motion, like large parallax scrolling effects, spinning elements, or rapid zooming animations, can trigger genuine physical symptoms, including dizziness, nausea, and disorientation, that go well beyond simply finding the motion visually distracting or aesthetically unappealing the way it might for an unaffected user. This means for these specific users, an animation-heavy website isn't merely a matter of personal stylistic taste they'd simply prefer to avoid, it can represent a genuine barrier to comfortably and safely using that website at all, similar in kind to how insufficient color contrast is a genuine barrier for users with low vision, not simply an aesthetic shortcoming. The prefers-reduced-motion media feature specifically lets a user indicate this need for reduced motion once at the system level, and respecting it in a website's CSS is exactly the mechanism that allows that user's genuine accessibility requirement to be automatically and consistently honored across any website that properly implements this media query, without that user needing to seek out and toggle a separate reduced-motion setting on every single site they visit.