I get that. But, if you telegraph by stepping out you look at every first pitch the first two times you see a pitcher, then from video they know to throw a strike. Maybe swing at an occasional strike, then at least act like you are ready to hit the first pitch instead of stepping out, that next pitcher might now just groove the first couple of pitches.
You can judge velocity just as well by standing in the box the same way you would do if you were possibly going to swing.
Maybe it's nothing, but it kind of bugs me.