I do believe they intended it to be stacked in the way it was. I don't believe they anticipated the use of that many sch's though, for the reason you stated. I would perhaps imagine at most a party of 6 sch's thinking to use it in the way suggested to kill AV on some other mobs. ~10k instant dmg isn't bad in my eyes, but nothing the player base will make use of that I can think of. Groups, especially here, are looking for the most efficient way to kill things to get everyone their gear or make tons of gil. They'll make up that 10k damage using other jobs, and then keep going because that 10k dmg isn't limited by the MV timer.
Beyond stacking MV in the way suggested for AV, what use do you see it having? Unmerited, you could lose dmg. It doesn't provide any great benefit when merited for solo play either. I also don't see any middle ground, that groups might opt to use it in. What is there for it?
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