Why do sch and smn share point allocation

[NintenPyjak64]

Just curious, I read many ppl suggesting players focus on both jobs should go all MND, they said the benefit of all INT for SMN or all MND for SCH is not very significant, but go all MND for SCH will has more advantage when Cleric Stance.

All INT would be the better option because SCH doesn't need 30 MND at all. I know SCHs who do T5 flawlessly with 15 MND 15 VIT or 30 VIT. What's important to a SCH is the MND that comes from gear, Weapon damage, and crit. As long as you mitigate damage, you're golden. SCH isn't a WHM and has a completely different playstyle. Yes having the 30 extra mind is nice and all, but like I said, it's not needed

The issue comes with playing SMN. SMN NEEDS the 30 INT in order to maintain it's famous DPS