I get what you’re saying, but for me seeing all the roads lead right up to the water’s edge and stop ruins that beauty you’re trying to achieve. It looks broken, like roads that run straight into cliff faces.
In the interest of getting a “very pretty” baseline, perhaps the generator could stop trying to construct roads that would cross water, the way it has (finally) stopped trying to construct them on top of steep mountain slopes. Or even if the road dead-ended 10 blocks before it hit water, that would look a lot less alien, a lot more like something humans would actually build, without requiring any more polygons.