DNA is horse****. It's an attitude held onto with a vice like grip from a small, less knowledgeable motor racing community and fans.
It's keep as a notion to keep status quo, and doesn't change because CAMS/MA don't know any better.
Australian fans like F1 more than supercars. It's the leftovers that get attached to supercars.
You ask any supercars fan why 5lt V8s became the prominent engine in the atcc, they wouldn't have a clue. Not just that, probably even figures within the supercars industry wouldn't know.
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