It's the accepting idea Ford (GM, Dodge, ect.) actually produced something bigger, better, stronger that a lot of people are afraid of. I'm not sure what it's like down in Australia, but here we (i.e. imports) have to fight tooth and nail to get accepted as anything other than a cheap econo box, especially by the domestic guys. Admitting that Ford produced a superior part, true or not, just gives the Domestic guy one more thing to try and rub in our face, and they do love to rub things in our face.
While the idea doesn’t bother me personally, probably because I used to tinker with mustangs, and would kill to combine the legendary robustness of the Ford 9" with the benefits of IRS. Combining the bests of import and domestic is a pill many people on both sides of the fence are not ready to swallow. There is still to much of a rift between the two sides for it to be accepted, but it's growing smaller and soon people will come around. Like it or not one cannot deny the benefits.