Which is fine, if you only want to move and resize things. Outside of those two options you're extremely limited in what you can do with the UI.
Just to give an example; I'd like to seperate the HP and MP bars and have them stacked vertically on top of each other. That's just not an option, keeping them next to each other horizontally is the only configuration possible. They're the same UI element so you can't even toggle one off without turning off the other for Jobs that don't use MP.
That's just not good enough in my opinion.