i do not understand my pitchers are not allowed to use a pitch that has been good for them. a lot of coaches seem to like playing square pegs and just keep trying to hammer it in there. if a pitcher, and her coach and/or father/mother told me she had a good pitch of a certain type, i would go to the well until proven wrong.
A good coach knows his pitchers strengths and weaknesses. Some pitching coaches watch a batter's practice swings to try to figure out their weakness, while other coaches pitch to their pitchers strengths. I fall into the latter of the two. I tell my DD to throw her best pitch and if the batter hits a home run, give her a "golf clap" as she is rounding the bases - its "mano-a-mano"