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If they were allowed - and proved to be advantageous - everyone would need them. Once everyone had them, the balance of power would essentially stabilize and all that would have been accomplished is that everyone went a little faster. That's not really the priority that the category was designed to pursue.
More subtley, different cars would react differently to more open aero rules. For example, any given airfoil mounted above the rear window on my Golf (a la the old F2 rally rules) would return a different benefit than one to the same rules mounted on the trunk of a Civic sedan.
Too much hassle. No real value for the category.
K
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What about is there any concern when the aero advantage turns into a liability, and cars start to go off course like large sheets of paper in a breeze? Ala, the IMSA prototype race at Road Atlanta back in the early 90's.