Umm thank you for your input too brother, but from my understanding, what the real field goal percentage setting does for you is that you do NOT need to know the shooting form of the player but still make the shot because the chance of the shot goes in or not is based on the shooting rating of the players and of course other factors like the defense being played by the CPU and etc...but mainly is based on the rating itself.
However, it is not really like an assist for the USER, yes it helps you in a way that you don't need to know how to shoot with certain players' form like I said before, but it makes the shooting rating of the players become very important to make the entire game's result more realistic, am I making sense???