Having a release point closer to the plate/extension is a good thing for a couple of reasons including perceived velocity and, it seems, better control (the longer you're providing force behind the ball in a relatively straight line and the closer your release is to the plate, the less margin for error it seems you'd have--accuracy of a rifle vs shotgun--though obviously the arm is movement isn't purely linear, like a rifle barrel, and has a rotational element).
However, the towel drill teaches extension with your arm rather than rotating the shoulders/forward trunk tilt--I agree with Kyle's article here:
Do you have any cues or drills that are useful to help a pitcher release the ball closer to the plate (including trunk tilt, rotation and arm path)? Or is it a non-teach due to doing things correctly upstream? If it's a non-teach, what would you teach re the upstream movements to aid in extension?
Also see this discussion here: