Chuck,
I guess my other concern would be actually enforcing the rule. Gateway made it easy by classifying flex levels for their putters, so you can simply say that medium is too stiff. Done. No more medium Wizards. What about manufacturers like Innova where the stiffness of a disc varies from run to run based on plastic they use? I had Firebirds I could bend in half and Firebirds I can't even bend a little. Forget plastic blends, they have 3 different Roc molds that are all approved under the same name that was sent in for approval back in 1987. I don't know if there are any Rocs out there now that are the same as they were in 1987. You can't just say "tell us what is illegal and we'll look at it". You either enforce the rule or you don't. Otherwise you end up with what you have now with markets saturated with discs that don't pass PDGA standards and nearly every player having at least a few discs in their bag that technically don't meet PDGA rules.