The American system has always been full-throated adversarial -- and extremely successful. The historical system of legislature could delegate, and if the delegation went bad, the judiciary could intervene, rather than the legislature has to intervene in every bit of administrative minutae.
Analogy would roughly be...idk, the CEO has HR handle pencil procurement. HR, over the years, used this to interpret they could swap in mechanical pencils, erasable pens. But the new CFO tells the board this has to stop, the CEO is responsible for signing off on expenses. And then the employees say this is a good thing, that'll get the CEO more involved. But the CEO is already involved, just busy with other things.