That's a really good suggestion, because a politician with his "war paint" on with some specific issue in mind is tactically incentivized to target the smallest

That's a really good suggestion, because a politician with his "war paint" on with some specific issue in mind is tactically incentivized to target the smallest region that solves his problem. And hopefully the issue runs out of steam after that. Or, pass a constitutional amendment capping the allowed size of the US Code at 150 megabytes(and allow Congress to cap the aggregate size of all individual federal agencies' implementations of that law at, say, 10 terabytes): So if you want to add a kilobyte, you have to remove another kilobyte somewhere else.