In theory, all linguistics are descriptive, no gods, no masters, but in reality rules exist to avoid confusion and by disrespecting the order you risk confusing the listener by implying that some combo of adj + noun exists as a seprate term when it doesn’t
It’s not grammatically wrong though. It’s a soft ordering constraint. It’s not a hard syntax rule.
If you’re being taught in a high-level linguistics class that it’s a hard rule, then that class is dog s***.
I’ve listened to enough syntacticians ramble about this topic for a life time.
In theory, all linguistics are descriptive, no gods, no masters, but in reality rules exist to avoid confusion and by disrespecting the order you risk confusing the listener by implying that some combo of adj + noun exists as a seprate term when it doesn’t