This is different from grammar rules. Because this is not a grammar rule - at least, not one that we discovered yet. We just don't know why they have to be in this order.

And in fact, as for breaking rules: It's the other way around. Grammar rules can't be broken or they'd produce ungrammatical gibberish. But this adjective pattern is kind of a soft, fuzzy "rule" that does have a bit of flexibility some of the time.