I appreciate all your insights and resources you shared.
The info I am looking for is more specific:
what is the purpose to pitch inside to move a hitter's feet?
what is the purpose to pitch inside to move a hitter's hips?
what is the purpose to pitch inside to move a hitter's hands?
Its more than just pitching inside to intimidate the hitter and to make the outside part of the plate more effective. What tendencies in a hitter's approach show the need to move any of these 3 areas on the hitter off the plate?