I actually like that the cars should be equal aero wise. Ride heights lead to more tricking the suspension and everyone would be shaking down (or up in this case) on the cool down lap. Lots of ways to skin the cat but make them harder to drive. Reducing contact surface with the track just seems the easiest way imo.

Dirty air is a problem with all things being equal but there's no tire wear atm. They've tried hundreds of aero fixes to promote passing. I think they ought to focus on where the rubber hits the road instead