The owners manual states very explicitly that one shouldn't drive the car over 62 mph if the spoiler does not deploy so the car must get "light" at that speed. Therefore I'm sure it has a use. The old Audi TT had that same problem. When they were originally built they didn't have that bar on the trunk but then too many people were losing control and Audi recalled all that were built until that time to retrofit them. The ones that were built after that time had them already on the trunk.