"a Pantera fitted with aftermarket shocks and stiffer springs would then have less nose-dive, less weight transfer to the front, less loading on the front wheels relative to the rear wheels"
Here's a great link to a website that actually shows what happens with anti-squat/dive suspension geometries....click the tabs on the top and it will run through an animated change in the Center of Mass/Gravity and the change that takes place, on the right top corner there is a play arrow, a stop and forward and back arrow to stop the animation.
I wouldn't have thought that with less dive there is that much difference in weight transfer or loading, but there is. Also you would certainly have less suspension geometry changes and therefore fewer changes at the tires contact patch, which in turn keeps more tire on the road giving better grip when braking. Wow...what a great discussion!