There is no reason that the cars can't be closer to their production roots.... after all, touring car racing is popular worldwide and those cars are considerably more production-like than your average American "stock" car.
If a car company wants an aerodynamic advantage, let them engineer it into their production cars like in the 60's. Don't just give everyone the same template to shape a plastic body to form. What's the point? NASCAR used to be about the engineering, bending of the rules and the skill of the drivers, now it's all about the advertising and driver marketing revenue.
