general has this option(combat preview) and i don't remember ever using it, maybe in the begining until i found simulators ..
it gives you vague outcome of battle, and it has no use what so ever
i was thinking what COULD be useful for general instead , and i figured that i often need STEP COUNTER to make sure my block works fine ..
suggestion is that that option gives little numbers that show how many steps general do before the attack,or enter area of effect
STEP COUNTER instead of combat preview, ftw
cheers