I played FFIV on and off for quite a bit when it first got revamped. Not sure what level I got to, but my biggest issue was all of the forced questing to unlock content. I've always hated questing, especially just for the sake of it. Strange as a huge mmo fan I know. However, I hated especially that you had to quest to unlock new classes.
What does questing and new content look like? I always liked the way they did grouping, and I enjoyed the white mage. Is it still pretty much just play all classes on one character? Which classes can main heal?