passing the ball to the scorer is in fact a harder decision that you claim because it butts right up against the personal ego (to score yourself and garner the esteem that comes with that). there's even a term for that: ball hog. also, the best shooter isn't always obvious nor a static quality. "best" is dynamic, based on the ever-shifting conditions on the court, and the winning strategy is to find that person dynamically in the middle of action, when opportunities are slim and fleeting.

as @kqr alluded, 50/50 decisions are a sign of the lack of leadership, rather than a tool to reveal it.