Just looked up why we do this and one of the first lines in this article is, “Adjectives are where the elves of language both cheat and illumine reality.” so I know it’s a good article.
Things this article has taught me:
This same order of adjectives more or less applies to languages around the world. “It’s possible that these elements of universal grammar clarify our thought in some way,” says Barbara Partee, a professor emeritus of linguistics and philosophy at the University of Massachusetts-Amherst. Yet when the human race tacitly decided that shape words go before color words go before origin words, it left no record of its rationale.
One theory is that the more specific term always falls closer to the noun. But that doesn’t explain everything in adjective order.
Another theory is that as you get closer to the noun, you encounter adjectives that denote more innate properties. In general, nouns pick out the type of thing we’re talking about, and adjectives describe it,” Partee told me. She observes that the modifiers most likely to sit right next to nouns are the ones most inclined to serve as nouns in different contexts: Rubber duck. Stone wall.
Rules are made to be broken. Switching up the order of adjectives allows you to redistribute emphasis. (If you wish to buy the black small purse, not the gray one, for instance, you can communicate your priorities by placing color before size). Scrambling the order of adjectives also helps authors achieve a sense of spontaneity, of improvising as they go. Wolfe discovers such a rhythm, a feeling-his-way quality, when he discusses his childhood recollection of “brown tired autumn earth” and a “flat moist plug of apple tobacco.”
Brain scans have discovered that your brain has to work harder to read adjectives in the “wrong” order.
TL;DR: No one knows why we do this adjective thing but it’s pretty hardwired in.