Perhaps it's a dumb question for more experienced players, but I've searched for the source of this claim, that most card counting in blackjack is based on, but have never found it. More high cards than low in a shoe would tend to lead to higher ranked hands for anyone playing including the dealer would it not? How do you know it won't just help the dealer in some scenarios, like one on one, etc? Is it simply a belief or did someone at some point run billions of simulations and find it to be generally true that more high cards will benefit the players more than the dealer?