From my limited understanding, the US has rather simple statutory laws. In other words, the legislature only promulgates 5 pages of law. But given that reality is complex, these laws cannot cover all the cases. So the judicial branch makes certain decisions themselves, and these decisions become binding to later and lower courts (a.k.a precedents). These precedent based laws are very complicated and amount to 500 pages.

So, I guess your idea won't work. Either the legislature thinks up front and publishes 500 pages, or the courts have to fill in the blanks between page 5 and page 500 themselves.