I guess just to make the fights last longer. And to stop people from being ganked so easily in world pvp. I remember in Silkroad before they changed how potions worked you could basically 2 shot someone. Fights ended pretty quick. Ranged characters ruled. But then they changed the cooldown on potions and fights started taking way longer. They even added auto potions. So whoever had the bigger bank won most of the time. Stunning became even more important to pvp after that.
Really hate that style of pvp. But to fix it they would have to rebalance the entire game. Unless it is like DNF where the pvp is separate and everyone's stats are readjusted.
