I've been watching quite a bit of girls high school ball this year, and I noticed that very few hitters stand at the back of the box, and many are at the very front. They set up like this even when a hard thrower is pitching.
Do softball coaches teach this, and if so, WHY?
Do the math. If a pitcher is throwing 60 mph and you setup in the front of the box instead of the back, you just added 5 mph to her pitch. From the front, you now have the same amount of time to get to the ball as if she was throwing 65 instead of 60.
Is there some other factor that I don't know about, that makes it better to move up?
To ME, moving to the front is the same as allowing the pitcher to move the rubber 3 feet closer to the plate to pitch.