I don't see the benefit in segmented housing for folders. There are enough low-friction cables and housings out today that they really aren't necessary unless you want or need that look.
The other question is segment wear just from the folding process. Since the segments were not necessarily designed to function well in a moving environment (folding/unfolding), they might not take well to cable grooving.
Of course, having said this, there will numerous testimonials from folder owners who are happily running segmented housing with nary a problem.