I disagree, stacking other players isn't the main goal. W$SD in big pots is, which often includes stacking other players. NL is a game where one big pot can change a losing session into a winning session (and vice versa). Playing a style which puts you in a position to win these big pots and surviving in the mean time on the small pots is what it is all about. Turn and the river is where its at, preflop and flop is just there to set the scene.