I can't say I agree Spawnie, while FF is generally a PVE type of game and less PVP, open world PVP does open the door for some interesting scenarios, such as fighting an S rank, where all AOE abilities can friendly fire. LOL
Or just friendly fire in general. It would make you have to think about what you are doing instead of just spamming the lit up buttons. This most likely isn't what it will be though, they are probably looking at WoW closely when implementing it. That's just speculation though.
With that said, it wasn't something I was exactly waiting for, it also doesn't feel like a waste of time either, especially for people that have been wanting that experience.