I am honestly asking you this, not a smart ass comment. In your experience and at least basic knowledge of aero/downforce. Do you think a wide open gate would have been better?
I really don't know (know not as in "I don't think so"... I really don't know). I would like a quick look over if you have the time. I know water drainage was considered in the design...
Not trying to bait you, I just really don't understand aero... and input would be greatly appreciated.
Maybe, maybe not. To keep air from reaching certain underhood areas, they probably needed to add that "deflector". On the drivers side, the intake tube is right in the way, which would likely disrupt airflow (create high pressure), so that insert (the notched section) most likely helps smoothly redirect the air out the hood vents.
Not an expect in aerodynamics either, just pointing out that there are compromises on street going cars. I am sure their CFD analysis helped make many of these decisions for them. Water/dirt/critter mgmt I'm sure contributed too.