Yeah, but it separates them in a random way. Not every QB that is inexperienced is inaccurate, and not every experienced QB is terribly accurate(McNabb).
I don't want the game to make me throw errant passes with a QB that's accurate but inexperienced. That's not sim. I'd rather have the game make it more difficult to get the ball to open receivers.
A vision cone isn't really needed; there just needs to be a clear indicator that tells the user who the QB is looking at. They could enlarge the receivers passing icon and make it pulsate.
That's basically vision cone, with out the cone, since so many people hate the way it looked.