Common Law's actual roots are in Anglo-Saxon customary law, were based on precedent, and for most of its history developed in a decentralised and bottom-up manner. Like customary law everywhere.

Codified, "Civil" legal systems are imposed from above, by fiat. Literally. F--k that. The Noahide Laws are codified fiat BS just like Babylonian and late-Imperial Roman law. (Modern Common Law is a hybrid. We should fix that. )