The rule "dealer stands on soft 17" means that when the dealer's hand includes an Ace counted as 11 (like A-6), they must stop drawing cards. This reduces the dealer's chances of improving their hand, which slightly benefits the player. In contrast, if the dealer hits on soft 17, they have more chances to strengthen their hand, increasing the house edge. Overall, the rule of standing on soft 17 slightly lowers the house edge by around 0.2%.