I would think that the pinnacle of engineering with CF would be a shaped monocoque structure rather than lugs and tubes. The advantage is putting the material where it does the most work, without duplication. So I'd question that a lug and tube design would be the best CF frame.
The analog in aluminum are the Cannondale frames like my old CAAD 10, where the members were so heavily shaped, no longer constant cross section tubes (whether round or square or twisted like the Lynskeys)
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