This has generally been my thought for a long time. And even when it comes to high or low mount front wings, that at a certain point, between the front wing and the shock tower, there is little that the body itself would be doing head long into the wind.

There is very clearly SOME aerodynamic effect the body has, but why and to what extent has always intrigued me. In my mind, i think the majority of any effect on the body aerodynamically would happen at extreme yaw angles in high speed corners, where most of the bodies side profile would be into the wind. And how much flat surface is being presented can make a big difference in stability, even if it is not a CFD optimized shape. Like a P2 with the fin, might feel more stable than the S2 with the lower profile greenhouse and stubby fin.

I am no aerodynamicist, but i love race car engineering, and have studied a lot of the basic principals of aerodynamics, and understand how some interactions happen, and why. I find it fun to think about, and think it would be something that would be interesting to test on some level, just so there is some definitive answer out there, instead of just anecdotal hyperbole about why something works one way or another.