Why grey text is a design decision, not an accident

A subscription page sets the price in near-black and the renewal terms in light grey at a smaller size. Both are present, both are accurate, both are legible under inspection. Readers recall the price and not the terms, and the difference in recall tracks the difference in contrast.

What everyone sees

Low-contrast secondary text is a widespread convention read as visual hierarchy — a way of indicating that something is less important. It genuinely does that. The question is who decided it was less important, and whether the reader would agree if the two paragraphs were set identically.

What is actually happening

Legge and Bigelow reviewed the psychophysics of reading and showed that reading speed falls sharply as contrast approaches threshold. Reduced contrast raises fixation duration and regression frequency, which increases the cost of reading a passage and therefore the probability it is skipped. The Web Content Accessibility Guidelines set minimum contrast ratios precisely because low contrast excludes readers rather than merely de-emphasising content. Deceptive-design research catalogues low contrast as a standard method for keeping disclosure technically present and practically unread.

Why it stays hidden

The decision hides inside a legitimate convention. Hierarchy is real and necessary, so a designer can lower contrast for honest reasons and a product manager can lower it for other reasons, and the two are indistinguishable in the finished page. The reader has no way to tell whether a grey paragraph was demoted because it is genuinely secondary or because it is genuinely inconvenient.