Yes, I was also wondering why you should double in this situation and had in mind that the optimal play for 10 and 11 versus 17-20 is to hit. As a general rule, these optimal hole card strategy tables (e.g. from WizardOfOdds) say that doubling is never favorable against a dealer pat hand. The only situation which might be different is when the dealer has soft 17 and the H17 rule applies. I have not seen any HC strategy table addressing the S17 versus H17 issue, so I am not sure if there are any differences. Also, the surrender rule is often not addressed but I read that surrendering stiff hands versus 10,11 and 19,20 is favorable.
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