Your argument is every team in college football has a left tackle. Yes, that is true. But how many of them deal with premier pass rushers with elite athleticism and technique? It's a little different blocking 240lb defensive ends with one move.
Also the 3-4 defense is prominent in the NFL and that puts an added layer of stress on the tackle position.
I think too much emphasis is being put on the Left Tackle. It's become a buzz thing, "how many franchise left tackles are there in this class". With changes to rules and offense Right Tackle is very important too, maybe slightly less but only slightly.
Protecting the blindside was all about not having Lawrence Taylor end your QBs career. Now there are rules in place that protect QBs from those viscous hits like the one Greg Hardy hit Carson Palmer with a few years ago.
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