The only healer that should get accuracy on their Cleric Stance is WHM. Something like +20%. AST and SCH have skills that increase their overall rate of accuracy, because they cannot miss (Moves that do not have a base damage, like Combust/Bio.) CNJ/WHM do not have any skills like this.
Since WHM is shoehorned into main healing, it has allot less to gain for fully investing in accuracy compared to the off healer role. If AST or SCH main healed with zero accuracy investment, they could at least contribute to dps with their zero chance to miss skills. (All raid tier healers should invest in capping accuracy, WHM should just get a reduction in requirements since they 1) originated the cleric stance mechanic 2) Have less time to utilize their accuracy 3) Have zero skills that can't miss. )
Just slap the medica trait onto the actual skill and trait cleric stance at level 16 instead.
