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Are serrations at the trailing edge more for noise reduction at the expense of increased drag?
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I think that's pretty perceptive, but why would the drag increase? Extreme aero-modding seems to have that side effect. I wonder how much energy is turned into noise, it may be negligible. But a quiet car is a happy car.
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...in order to form a vortex which is attached to the panel and has momentum to follow the same line
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There's something else I wonder about. Are vortexes contained within the hole the car punches in the air (its maximum cross-section) or do they expand outside of it?