Seyta,
I can appreciate the advancement in materials--thank you for the link. But the nike victorys from 2010, and the adidas melbourne from 1965, and my ventulus and jasaris from 2000 were all more alike than they are different--they all had the same goal: be as light as possible, and get out of the way and let me perform to my best, while protecting my feet with a thin sole (as opposed to going barefoot).
Can you appreciate the view that these new vaporfly shoes are fundamentally different in that they are more like a DEVICE to artificially aid performance, rather than just an improvement in materials?
If two years from now, someone makes a more runnable version of the kangaroo shoes I linked from amazon above, that will be ok with you, in the name of innovation? Competitors pogo-ing down the road, their feet 20 inches off the pavement at footstrike?
Can you see how that is different?
To take the track analogy you bring up: we all agree that modern rubber tracks are faster then old cinder tracks. But if someone developed a track that used a trampoline effect to actively launch the runner forward with each step, you're practicing a different activity. It's not simply an advancement in materials.