The CG usable envelope increases with lower wing loading -
Dick,
This is certainly a more defensible statement than "if it's light enough, CG doesn't matter". It is probably true, in the limited sense that one is more likely to be able to fly an unstable or barely stable plane if it is flying slowly, as has been mentioned before. I don't think that it is news to many people that lighter is better for an airplane. Nor do I think the ridiculous 'rules' you've larnt help get that point across.
banktoturn