> Or is the idea that its impossible to anticipate all possible edge cases and congress wants to let the agency iron out future issue?
This Plus, it's often a case of Congress kicking the can down the road: Enough votes in Congress might agree that something needs to be done, but they can't come up with agreement on the details — often because of conflicting special-interest (read: donor) lobbying about those details. So the legislators say, in effect, "OK, let's get 'a bill' passed [a minimum viable product, if you will] and let the agencies deal with it. Then later, if a major problem comes up with a particular agency ruling, we can revisit the issue then."
This Plus, it's often a case of Congress kicking the can down the road: Enough votes in Congress might agree that something needs to be done, but they can't come up with agreement on the details — often because of conflicting special-interest (read: donor) lobbying about those details. So the legislators say, in effect, "OK, let's get 'a bill' passed [a minimum viable product, if you will] and let the agencies deal with it. Then later, if a major problem comes up with a particular agency ruling, we can revisit the issue then."