Death I'm skeptical about and I'll believe it when I see it first hand or in a video.

FullCure sounds like a lot of bang for your buck when you cast it at 30 MP, except that you're precluded from casting just about any other spell while your MP is that low. No Curaga, Stona, Viruna. No Raises if someone gets knocked out. No Cures at all while you're trying to refill that gap from 0 to 30. Yeah that could only take a few seconds if you're really loaded up on Refresh, but I find myself in a lot of situations where I don't HAVE that kind of time. As soon as I finish one cure, I have to move on to the next one.