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Because most endgame gear is more stringent on who can wear it, you literally cannot just wear a full intelligence set on Scholar. You'll instead be wearing MND focused healing gear, and your MND is going to drastically outweigh your INT... even if you put all your points into INT. Not to mention that with the numbers you get at endgame, the 20% penalty to healing from cleric's stance is a bigger issue than a mere 30 points of MND.
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Depends whats geared up first.
If you have a geared SMN, I would 30 mind till in most of BIS, then 30 vit, vice versa if other way around.