BaCardi and ArtL are each making valid points and stating facts -- the only conflict here is arising in the stock we're supposed to put in each set of facts. I'm not sure there's a solid answer.
It's absolutely true that smaller platform pedals can contribute to discomfort; the smaller the platform, the more it's working against the stiffness of the shoe sole. BaCardi's reference to top pros ditching small-platform SPDs even while wearing top-quality shoes reinforces the notion that even the stiffest sole is working against hotspot forces.
Art is simply representing the other half of the facts. True, the SPD-ditching elites weren't wearing "crappy" shoes. Nonetheless, technically, you could be pedalling on a piece of rebar if the siffness and fitting technology behind your shoe is sound enough. A stiff enough sole, properly bound to a pedal of any size, should have the same effect as a giant pedal and a floppy shoe.
In other words, both the shoe sole and the pedal design have a mutual responsibility in preventing hotsots... something you've each agreed on at some point. For practical purposes, most consumers, shoe designers, and pedal designers pursue both to some degree -- stiffer, better fitting shoes, and more effective, broad, stiff pedal platforms.
What does this have to do with the thread, anyways?