Without arguing with your specific wording of "completely unambiguous and free of arbitrary cutoffs etc.", I think the implicit point you're making that a group of highly intelligent people couldn't sit down and come up with a significantly better new set of laws "from scratch" is wrong. I think they could, if that were their only aim, vastly improve laws and government with a noticeable improvement on average quality of life in the world. The obvious problems and the reason this won't likely happen soon are politics, power, trust, etc.