I've been waiting for a main title FF with battle mechanics like this for so long! Command prompt style was fun, but it's gotten a little old, imho. Plus, after some of the minor titles (Dissidia, Dirge of Cerberus) I knew there could be more than just command prompt style.
I think development in all directions is a good thing, including repetition of ideas that worked; it helps the really good ideas to stand out even more.
"If it is to be, it is up to me." - William H. Johnson