Dunno, Cam. I'm still thinking "more stuff" just means more slop to ruin the laminar flow at the foot of the sail. A good slug, adequately sized and sewn, ought to hold well enough, and then there's always the tack/clew rings themselves as the real stress holders.
Not that I'm a wizard on sails and sailcloth. And I note that the alleged wizards often seem to change their ideas every few years. But North generally seem to hit the mark, or at least come closer to it than a lot of other folks. (And at those prices, they darn well should!)
Besides, less slugs means a lighter faster boat.