Took the words out of my mouth... special rights simply because a spouse chooses to work for the Feds! States have state specific knowledge requirements that will necessarily be deleted to normalize tests across the entire country... Plumbing is far different in the northeast than in the southwest... real estate laws are different everywhere... etc. etc.
And who are the federal legislators representing? Their own constituency, or some other unrelated interests?
Wheatfield, Indiana, could sell taxi licenses that would be good in New York City; New York City could sell timber inspection licenses that would be good in Sitka, Alaska. The opportunities are endless.