We should note that Moses was not a law maker. Moses had a prophetic role in the giving of the law. He received the law from God and passed it on to the people. His skill was in hearing God, not in making laws.
Since then, no prophet has risen in Israel likeMoses, whom the LORD knew face to face, who did all those miraculous signs andwonders the LORD sent him to do in Egypt—to Pharaoh and to all his officials andto his whole land. (Deut 34:10,11).
This is another role that was completed with Moses. God’s law is perfect, so he only had to give it once. Jesus said,
I tell you the truth, until heaven and earth disappear,not the smallest letter, not the least stroke of a pen, will by any meansdisappear from the Law until everything is accomplished (Matt5:18).Many men and women succeed Moses in the office of prophet, but they do not have the role of law giving. That task was completed with Moses. Even Jesus did not have to change the law. The role of law-giver finished with Moses.