Oh god now I find myself really wanting to argue about it again...
But I'm going to drop it, the KSG is a doomed gun and it will never be usefull ever again...
Too bad :p. But just this ONE thing; halving the damage isn't usefull at all, it's just slowing down the process of you being killed without you actually killing anyone. You said before that it's meant for others to stand behind you and shoot. Next to the fact that I don't even know if that's possible, to take advantage of the KSG while shooting "through" it, no one is ever (EVER!!) going to walk behind a KSG wielder while shooting. You can be flanked and not be able to let your protector take all the damage. It is way handier to just walk around freely with lower freeze and dodge all bullets while taking down your opponent.