Edit: It's not about making the "best" decisions. It's about having Full Control over your characters, also considering time required to give a certain level of control.
I guess it is because ALL your exemples (in which you always know what's coming next) attempt to prove that you could make a better choices with pos-up You'd probably have to change a few things at every combats, obviously (mostly targets). But don't forget that most of the examples given in the previous pages are all about the wizards and eventually the sorcerer...
