There are more stats than this, average points participated, win participation, time with ball, all of those are normalized for amount of games played and time on court. But at the end those stats you've mentioned matter, hoops scored, rebounds caught, penalty shots, and score passes/assists are what "wins" a game.

An important part of a statistical model is to also be simple and cheap enough to implement to gain actual statistics, the chance that there is some magical player that doesn't score high on stats but somehow has a meaningful impact on the game that isn't somehow scored is very very slim and in Basketball specifically probably non-existent since it's only a 5vs5 sport which means that every player handles the ball.