As always, Dick you make a compelling case but I still have fundamental concerns in terms of the cohesion of the category, and of the classes within it.... I would say the rule one is to protect the process and to insure that no violation of the process does harm to the racers who rely on the rules process for fair competition.
My second goal would be attempt to allow members to do what they want as long as it is safe and does not violate rule one. ...[/b]
There are always shades of gray, so let's look at one that's closer to the extreme end of your scale - we'll call it "white," where everyone gets to do quite literally everything they want. We'll call Kirk's end "black" (as in evil), where rules Dementors like me suck all of the joy out of racing.
What's the analog to your suggestion that people be allowed to keep their Shelbys in A, at whatever minimum weight they can possibly attain (as long as it's above 1945, of course), in the cases where ITA cars got more weight added to them, also based on the process? Those guys were plenty unhappy about the situation, as I recall.
"Please let me run at my old weight for no points or trophies" - OK or not OK?
"I'll run on 6" wheels, if I can keep my old weight" - OK or not OK?
"Make all of the other cars lighter" (a real suggestion as I recall) - OK or not OK?
Etc.
They simply got told to bolt in some weight and quite whining - OK or not OK?
I'm not trying to argue sense with the absurd - really. I just find that it's easier to parse out issues and solutions sometimes if I look at examples out toward the ends of the curve. The limits to what's OK are always arbitrary to some degree, so the question becomes one of what we are collectively comfortable with. And there are ALWAYS costs due to outcomes of taking a new location along the black-white continuum. Heck - there are costs associated change, in and of itself.
Further, we don't even KNOW what the costs will be sometimes.
So, I'm convinced that the dual classification option *might* be a good way to deal with some really special cases, where the benefits outweigh the costs. (And equally convinced that the language of that allowance would have to be VERY carefully crafted.) I'm just not loving the cost/benefit math of going whole-hog with the idea, applying it to every car in every class.
K