Actually, I'm beginning to understand MFE's point.
Consider that when you stretch silly putty slowly, it will keep going until it's a thin, hairlike string. But, if you stretch it fast enough, it breaks. The behavior of this elastic material varies by rate. I can see where tires, also elastic, would behave similarly.
As I said, "performance" encompasses many factors, but "stopping distance" is fairly specific. Yes, the right tools will allow the driver to use more of the available stopping power more effectively, which could lead to shorter stopping distance for that driver. More importantly, depending on the intended use, it could mean shorter lap times, etc.
But my original point stands, that there are many ways to improve overall braking performance, before we spec larger rotors, which in my opinion have the worst tradeoff cost, which is higher unsprung weight.
