The original question was 'what is the rule for ordering adjectives [in English.]' The first thing you said was: How about this rule? Order the modifiers to maximize the product of their successive restrictive effects.
I'm saying that your observation people copy what they know is tautological, and tells us nothing whatever about the restrictive effects of a given adjective.
How is Order the modifiers to maximize the product of their successive restrictive effects equivalent to "people copy what they know"? The restrictive effects of a given adjective are an input to the model because that issue was never the question. The ordering was the question, and that's what my proposed model attempts to predict, given prior knowledge of restrictive effects. The interesting prediction it makes is that people prefer orderings that converge rapidly and evenly.
I'm saying that your observation people copy what they know is tautological, and tells us nothing whatever about the restrictive effects of a given adjective.