Steve, I agree. The established classes, especially those that are under the umbrella of IFMAR competition, are well-established and won't benefit from change for the sake of change. These classes have had many years for the rules to sort themselves out, so I wouldn't advocate any changes. Other than addressing new developments in the class that may conflict with existing rules, I think ROAR's time is better spent addressing and refining the developing categories, especially those that will attract newcomers.
I agree with your sentiment about the rules - I much prefer to just show up and race without having to put your car through a gauntlet of rigs and gigs. Nobody enjoys that part of racing, especially at the Nationals, but were all suddenly much more fond of the rules when someone else is breaking them. ;o)