I was wondering how everyone would feel if all weapon skills were restricted to the original class. I see many complaints on how bland the animations are, and I feel this is, in part, caused by their availability to other classes.
It's tough making unique animations for every single class/race/weapon skill, and then making unique versions of weapon skill for other weapons. I think SE probably made the best choice in regard to making the animations, but I feel as though the flaw in design leaves everything else lacking.
In addition, I don't see much in using other classes weapon skills; my own skills will always be superior in every way. I suppose many classes get some use out of Skull Sunder II, but I don't think it would have much balancing efforts involved to make this change.