Actually, YOU have been the one all along saying that that IS all there is too it, when just about everyone else has been trying to tell you that there is more to it than that.
Of course shooting threes well helps. Of course limiting the other team's threes helps. So does rebounding the basketball. So does not turning the ball over. So does forcing a lot of turnovers. So does getting to the line and making foul shots, and limiting your opponent getting to the line and therefore making foul shots. So does shooring twos. And limiting the other team when they shoot their twos. And, well, you get the idea.
Or maybe not you, but the rest of us.