Sure, you can be skeptical, but the same can be said for equipment with skewed stats themselves. And the devs are always working to balance skills for different classes, how would this be any different? I still think this would be a great addition to this game and just to squash the idea for the sake of not having to deal with balance issues is ridiculous. All online games have this issue, but it shouldn't hold the game back.

In short, you balance it as you would any other skills. And it wouldn't necessarily need to be limited to skills but traits as well.

This system is also found in other Final Fantasy titles, so wouldn't it have a nice home in an online version where they're looking to make changes and get closer to their roots?