Vs. overall diameter, wall thickness has very little bearing on overall stiffness.
That kind of arm waving won't do, there were commercially available tubesets in the olden days using the same ODs where one was twice as stiff as the other thanks to thicker walls.
On the other hand, everybody calm the fuck down; the standard 531 tubeset was stiff enough for most people, and going just ⅛" oversize all round sorts it out for the few large riders who genuinely struggled with old-school tube sets.
That kind of arm waving won't do, there were commercially available tubesets in the olden days using the same ODs where one was twice as stiff as the other thanks to thicker walls.
On the other hand, everybody calm the fuck down; the standard 531 tubeset was stiff enough for most people, and going just ⅛" oversize all round sorts it out for the few large riders who genuinely struggled with old-school tube sets.