I think it should be possible to choose between centralism and federalism for your civ (not as a gov type). Federalism could give these effects:
- waste is reduced,
- corruption is reduced, but more commerce is going to the state itself (= nowhere), lowering the commerce going to the national treasury compared to centralism. Thus less commerce.
- culture flips are less likely to occur.
- civil disorder and civil war are less likely to happen.
- like governments shifts, it should take some turns to establish to prevent from switching too often. No anarchy but perhaps a bit more corruption during that time.
- it should only be possible for some government types, like republic and democracy (despotism are centralist to its nature).
- it should require some tech of course, say democracy