That doesn't really answer the question though.
Just because older TA cars had basic aero, why does that mean the category shouldn't continue to push the boundaries in the quest for seconds? You can only have so much power and put it to the ground, eventually you have to make up time elsewhere. Tyres, suspension, aero, etc.
Or would you rather cars still be running the same times as Tsukuba as they were 5yrs ago?