Now you're going to call me out here. ~20 slots of material is a long way from a fully VIT capped PLD, and you would be correct. But you're wrong, when I say, that a missing 30 VIT (the skill points) is going to make a large difference, not when I have 80 points of MND OR VIT at any given moment.

I am putting all of my skill points into MND. To put it simply, 1 cure can make the difference in battle. For VIT to make a difference, 1 Cure already has.