Yeah but turn that around the other way: why can't we learn from NASA? Go take a look around their website. It's much more user friendly. Same with their schedule, both for the year and for each event.
Personally I like SCCA class rules much better because it allows room to tinker and avoids grey areas better, but I can still see why their simple p/w ratio rules are popular...
And none of this regional vs national nonsense...