I feel that a little bit of your so called 'roading' is necessary. The game mechanics, especially flavor ones for specific nations, need to be at least somewhat likely to occur for it to be reasonable. An England that exists entirely on the continent after losing its homeland to Scotland doesn't have much need for the "Wooden Wall" nor does a Russia pushing west into Germany need the Siberian frontier colonist benefits. I think to make the game feel flavorful it needs to have its mechanics at least tangentially mach history. I don't care if the aforementioned England rules Gaul and has reduced France into an OPM in the Alps but it still should have control of the Isles or else its naval mechanics don't makes sense. But that is just my opinion. Then again it makes me happy to see my games follow a somewhat historical path. I know others revel in ridiculous alt history.
I will however say that the EUIV mission trees have created anew problem of numerous generic nations, which they had also resolved with the last vestiges of "National Ideas" being confined to southern Ethiopia. That does make me upset. It gives majors and those treated with Expansions an unfair advantage.