70 GTO RPO codes question

[Supercar_Kid]

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ITS A SIMPLE FACT. THE GM AT CHEVY BELIEVED THAT ALL SS CARS SHOULD BE EQUIPPED WITH DISC BRAKES AS STANDARD EQUIPMENT AND THE GM OVER AT PONTIAC DIDNT BELIEVE SO.

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C'mon Don...it's the WHY I'm after...not a reiteration of the obvious facts.

Xplant...thanks for your response. The notion of particular divisions having particualr areas of responsibility for development makes sense...but weren't disc brakes pretty well developed by 1970? They appeared on 1967 model Chevrolet's and were mandatory on most performance models only 2 years later. I don't think the reason GTOs didn't get disc brakes as part of the package had anything to do with Chevrolet's claim to the development of the braking system itself, or Pontiac's lack thereof as disc brakes were available on GTOs just not a mandatory inclusion like they were on Chevrolets.
I think we may be on the right track though. Anyone else have any insight or insider information from GM?