While I understand where you're coming from since MND was always the primary attack modifier for any light-based spell in the majority of Final Fantasy, we'll just have to appreciate what Yoshi-P has done to help simplify and streamline the dynamics of the game. In Cleric's Stance, you are still technically using your MND to boost your attack damage, just, in a different way =p

BTW, in my opinion Holy is so much better in this game than in XI outside of select circumstances like below: