Yeah, I was thinking the same. Once the person has committed to the attack, they should only be able to turn, lets say, 45 degrees to the left or right. If they want to turn more they'll have to either cancel the attack or wait till the attack is finished. This would make good footwork more rewarding, as it would actually be possible to dodge an attack.
I was also thinking that maybe the degree to which you can turn, could improve as wpf gets higher, with respective weapon.
Maybe for example less than 100 wpf means you can turn 45 degrees to the left or right once committed to the attack.
100 wpf means you can turn 50 degrees.
135 wpf means you can turn 55 degrees.
And 170+ wpf means you can turn 60 degrees, which would be the cap on turning ability.