Some of the engineering white papers that Nascar has done on their chassis' has shown that the area of the Cowl/A piller is one of the key structural areas in maintaining chassis rigidity in the cars with their speeds and over the duration of their races. Improvements in this area translate directly to improved suspension performance and driver feedback.
Plus, like Vince said, the added safety of this layout with the types of impacts they sustain is never a bad thing.
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