No doubt it draws the heat out, but we do still want to keep some heat in and the majority of moisture out. That is the trick when designing a functional flow. You draw too much heat out, your engine will dread colder weather. But, I seriously don't think you could possibly reach the speeds where this would be a factor, heh.

As for moisture, it's really not a big deal, but I don't think you want so much that it manages to soak your wiring/electrical and puddle up wherever it can. Bad enough I have had rodents chew some wiring a couple of times.... but I don't want to track down a short because of moisture. I can at least see where the little buggers chewed away, heh.

It's tricky when you want functional. You want looks, hell, you can just browse the web and pick up any stick-on POS you come across and call it a day.