Because In a game there’s an ump calling balls and strikes based on a plate and there a batter that should be swinging at pitches based in part on a plate and the strike zone as well. So I find it odd practicing pitching without Using one. Just an honest question about practice habits and seeing if anyone has ever noticed a difference in their DD in game pitching using a plate vs not using one in their practice sessions.If the catcher does not move, what does it matter if there is a plate or not?