I'm not the most educated on ski constructed, but I often wonder why something as soft as P-Tex is used as ski bases?
I know P-tex replaced Pine/tar bases for a number of reasons, but you would think nowadays we would have a better alternative.
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As for rear flexing boots, what exactly is the appeal?  I can understand more freedom in motion, but it would be taking about a 30 year step backwards.  Skiing in something like leather boots which give you the ability to flex backwards tends to send people into the backseat immediately and basically is way harder to control your edges.
Not to mention having no rear support is a one way ticket to toe-bang.
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I also think it would be pretty cool if DIN hadn't pretty much destroyed the plate binding industry.  Some models from the 70's are arguably more safer then today, and could release practically every direction including down onto the ski.
(keep in mind I'm not too educated in gear so there's probably some underlying reasons this stuff doesn't happen)