1.) Standing on Eleven is NEVER a correct decision because there is absolutely zero probability of the player busting on the first card.
2.) Furthermore, if you have a certain number of cards remaining in the deck, then each individual card has an equal probability of coming out. What that means is, what if a player hits and gets a three? If that happens, then the dealer is now MORE likely to draw a ten than he was previously because ten-value cards are now a higher proportion of the deck than they were before that hit. Unless the players KNOW what card is going to come out, then there is absolutely no reason to not make the best playing decision.
3.) Also, there are only two ways that a dealer can have a total of Soft-17 without having already taken a hit. The dealer can have an Ace underneath (hole card) and a six showing, or the dealer can have an Ace showing and a six underneath. If the dealer Hits Soft-17, then in an eight-deck game (or any decks) the player would DOUBLE DOWN against EITHER a dealer six or ace knowing that the dealer doesn’t have the goods. If the dealer Stands Soft-17, then the player would DOUBLE on a dealer six showing no matter what (with a total of eleven), HIT on a dealer Ace showing with 3+ decks, but it becomes a DOUBLE with two or fewer decks on Stand-17 because the dealer having an Ace but no Blackjack affects the deck composition enough to make doubling the correct decision.
4.) You are failing to consider that a Ten does not cause a dealer with Ace-Six or Six-Ace to bust, it just gives the dealer a total of Hard-Seventeen. You’re better off for the dealer to have to stand on Soft-Seventeen than MAYBE ending up with Hard-17 and then having to stand anyway.
5.) Alternatively, if it is Stand-17, then a dealt A-6 or 6-A for the dealer leaves the dealer with the weakest possible finishing hand he/she could have without busting, which is clearly a positive for the player. ESPECIALLY a player with a starting hand of eleven total.
6.) Even if you were right in your situational, which you unequivocally are not, (I’m sorry) dealers are going to end up with Soft-17 more often having taken multiple cards already rather than starting with A-6 or 6-A already, simply by virtue of the fact that there are so many possible ways to do it. With that, one situational is not sufficient to change the general rule.
And, I cannot emphasize this enough, standing on a total of eleven is, probably, one of the Top Five worst possible decisions you could ever make at a Blackjack Table. That would be almost as bad as hitting on 19, or something along those lines. It’s just an awful play.