Here's a question. If sole stiffness is so important for power transfer and other road racing aspects, don't relatively squishy, flexible insoles/liners (as they all are) degrade or even negate the performance of the sole? Ever the squishiness and flexibility of the foot would seem to negate the stiffness of the sole. How does it not? I'm not talking about isolation of the foot from the pressure points on the pedals, but rather pedaling efficiency.