Motion
Scroll, transition, and when movement stops being decoration. The honest uses cover a wait that exists anyway; the rest spend the reader’s attention on the page’s behalf.
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Scroll became a projector
Scroll used to move the page; now it advances a sequence. The reader has lost a control and gained a timeline they cannot skip.
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Transitions that hide latency
The honest use of animation: covering a wait that exists anyway.
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Movement nobody asked for
Reduced-motion is a real preference and a large minority hold it.