The focus still has to be on getting the batter out, and if I feel like a change up or drop in the dirt is my best bet against a batter I need my catcher to be good enough to handle it. You can watch the most skilled batters all the way through college and MLB who get themselves out on pitches in the dirt every game because of the way they were set up with other pitches. If they were that easy to read it wouldn't work so often. Oh, and I definitely DO call for pitches in the dirt regularly.With runners on it's never okay to miss in the dirt. 99% of catchers won't throw out a speedy runner who takes off and the ball is thrown in the dirt. Pitchers with control don't throw balls in the dirt with runners on imo