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I use Stone as an example, as the t5 spells are not worth the MP for the dmg they do.

I look at it like this;
I can rapidly cast stone for 1100+ dmg
in the same time that I can cast 4-5 stones a SAM can let loose at least 1 if not 2 Tachi: Fudos for about 9k ea.
BLM and other magic...