To give them the benefit of the doubt, a WHM shouldn't need to cast more then Stoneskin and Regen on the tanks, Cures on DPS who take unneeded damage, any tank damage can be healed by the SCH or Fairy since it's minimal at best unless it's in Sister Phase. Garuda Ex is a very easy fight for healers and there's many times where Stoneskin alone will pretty much add 3+ more DPS (both healers in Cleric Stance and PLD using Sword Oath).
This still doesn't justify using tanking accessories since the extra mind will convert into more DPS while in Cleric Stance
