Repeting content from one game to another is fine, as that is what makes a Final Fantasy game what it is.

But repeating content in the same game is not a good idea. I had to farm Ifrit HM for his weapon a few dozen times too many with my main class and now i'm sick of him. Even when I get to 50 with other classes, I have very little desire to farm him for the weapons. I hope they don't give us extreme versions, and that if they do, they make the fights totally new and interesting for those of us who can do the HM version with our eyes closed. Too much repetition is a bad thing!