Was surprised to find out that the HD remaster of FF Type-0 will be rated M. The first for the franchise if I recall correctly.
It would appear this is going to be a very violent, bloody and gritty game.
To be fair though some other FFs would probably be up there in the M rating as well if they were made in the modern day, 7 and tactics both stand out to me in that way. The only thing that kept an M rating off older ones was the lack of realistic graphics really.
Sorry for responding late but you're totally right. The only thing preventing some earlier titles from jumping over the "T for Teen" threshold was the lack of realistic visuals. If we had a modern day FF with all the (presumably uncensored) profanity, violence, terrorism, death, blood, and boob physics, it'd definitely hit M without a hitch.