First-time poster here. I'm trying to decide between a sport and non-sport version of the Impreza. A silly question for you: what's the point of roof rails that go along the body of the car from front to back? It looks like the vast majority of the utility you get from whatever roof system you have comes from the crossbars, which don't require roof rails at all (because crossbars can be attached directly to the roof). I'm surely missing something - please tell me what.