The long run is supposed to change the way you play blackjack. N0 more or less quantifies the long run and all else being equal we select our games according to the lowest possible N0 (or highest possible SCORE; as they're quite directly related).
To look at it another way, at a given game we try to pick whatever bet spread makes the long run come quickest... different spreads affect N0 differently depending on the specific game. But since N0 is proportional to your average doubling time, picking the shortest long run also maximizes your long-term growth.
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