Black and white is not as good as everyone seems to think. There are reasons you don't enumerate every possibility ;) (courts will then interpret that as a complete list, instead of extending it to cover similar situations)

If you had black and white fair use, for example, you'd just be railing against the fact that courts wouldn't extend it to cover new similar thing X.

Black and white is good for establishing baselines in law (IE "these things over here are definitely okay, and everything else should be judged by these factors" It's rarely that great if you are trying to make a license that stands the test of time and march of technology.