The catcher is the only one who can catch the ball and if he can't do that, there really isn't a way to help him. It isn't so much about stealing strikes as it is not giving them away. Guys like Larue and Ross who aren't real smooth back there who swat at the ball to knock it down because they don't catch it well, cause a lot of close pitches to get called balls IMO.
I agree with you about calling a game having a huge impact, but for a position called "Catcher" seems to me that catching the ball is job 1. I might giive you the nod on the other stuff. A catcher needs to know the situation and the status of his pitcher.