James Q. Wilson said this quote

“ Many, if not most, of the difficulties we experience in dealing with government agencies arise from the agencies being part of a fragmented and open political system…The central feature of the American constitutional system—the separation of powers—exacerbates many of these problems. The governments of the US were not designed to be efficient or powerful, but to be tolerable and malleable. Those who designed these arrangements always assumed that the federal government would exercise few and limited powers. ”