It's like people can't read. Shirk has a long recast. Shorten it and off tanks can just drop aggro faster. I have done end game raid, and still thought the same thing. Old tank stance made much more sense when it affected you with defense buff/attack down, versus attack up/ def down.
SquareEnix got rid of "stances" because low skill players couldn't manage it well. I'm just encourage the simplifications further. I actually enjoying the skill with switching stances...old style.