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My understanding of aerodynamics is that the air comes over the windshield, above the cabin and then around, hitting the deflector from behind as it were. So I'm not sure if hole-less deflectors would be more inclined to blow off, as some comments below imply.
That being said, I've never seen a windscreen element on any car, that crossed the width of the vehicle, not have "holes", including BMW (the six series using a small solid windbreak), Merc, Audi, Porsche. This leads me to believe there is a reason not to have unperforated wind deflection. I'd be curious if any of the engineer types on the board would know why that is.
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