Some random reactions:
Kids are different. I have one daughter who is a creature of habit, who would benefit from the "stay in the same place in the box" school. I have another daughter who is a competitor, who will hit anything, any time, any speed, any distance. On a recent visit to my Dad's he had a bowl of jelly beans for the girls. The older one, the competitor, said: "I bet I can hit those." Next thing I know I'm throwing jelly beans to my daughter. Yeah, she can hit them. Move her in the box, make her stand on her head, whatever.
Coaches, and hitting instructors, are different. And each is "always" right. And, to be less flip, most of them have things that they teach that are hard to argue with. I would guess many folks in this forum have 3-5 voices in their daughter's ear (hitting coach, club coach, school coach, and you, sometimes more). I realize I am an extreme case, but ponder this: We have moved states in the last year. So in the last calendar year, by my quick count, my girls, between them, have listened to 14 distinct hitting "voices."
So, when you want to move a girl up in the box, because the pitch is 10 MPH slower than she wants to ideally hit at, who does she listen to? Hitting coach? Coach who just asked her to move up? Dad? (I loved a game last year, when a teammate of my youngest sauntered over to the fence, in the ODC, and whispered to her Dad: "So I take the first pitch, right?" Then I watched, bemused, as the 3rd base coach did all of his elaborate signs for naught.
I understand the Howard "don't move, stay in your zone" theory. I am sure it works. But in doing so, you also must have taught them patience, so that they are able to comfortably wait the LONG extra hundreths for the ball to get to them. I also thing this is grand if you are the hitting instructor AND the coach. But if I am a coach, and I have a down-in-the-order hitter who doesn't make timing adjustments easily, I don't understand why standing physically over the plate trumps cutting 2-3 hundreths off of the pitching time.