When it comes to MP efficiency, he's actually making a pretty valid point. If you're a SCH, and you're running out of MP(even outside Abyssea), you need to get more refresh/sublimation gear, and you need to learn how to use your strategems correctly. I never run out of MP, and I have terrible gear.
EDIT: By the way, to the OP: If you're playing any mage job, you should already have an IDLE macro, or else you're doing it wrong. If you're playing SCH, your macros should be complex enough to make this work for sublimation IDLE gear vs. regular IDLE gear.