Quote Originally Posted by SirTaint View Post
Stance dancing in PLD is much more cumbersome and complicated then WAR. Oaths are on GCD and break combos.
They also cost Mana. While you aren't using Flash while DPSing, it can be bad if you suddenly need to go full on tank mode and have no MP left. Otherwise you're primarily DPSing with Riot Blade (which may not be a bad idea with the additional abilities now) if you're stance-dancing a lot.

Edit: What HeavensSword said.