The ease of the prosecution proving their cases is not a higher priority to me than the feasibility of an average citizens reading and understanding most laws.
As I see it, the government's only job is to protect its citizens, and anything that gets in the way of it doing its job is counterproductive. I agree that a best-informed populace probably must also be the best-protected, but I disagree that the solution is to limit all legislation to the eighth grade level of diction. Free legal aid as a constitutional right seems like a slightly more practical alternative to me.