You don't get it.
They can get closer to you, in fact they must get closer to you, and can use quick attacks to slash or smash your head a lot easier than others, because the shielder will be in your face.
#2:
Then, your previous argument saying "damage isn't around equal" fails, Hence you saying that anyone can stack PS to two hit people.
I'm aware that this is leading to nowhere, but oh well.