Your characters won't become godlike clones until after you've beat the game and have actually started doing sidequests. xD It's just like the Sphere Grid in FFX (though that gave the characters more defined 'Jobs', while the License Board gives you the freedom of full customization).

The license board gives you great customization to your characters, instead of going on predefined paths, you can set them down a path of your choice. Why complain about being overpowered/ there isn't enough variety if you're the person going out of their way for gratuitous leveling? I let my party stick to the paths they were on, to define what characters did what jobs effectively. I'm not even going to think about making them teh uber godliness until (well, if) I start doing the crazy elite hunts/bonus espers and such (where having a variety of abilities for your gambits so you don't get slaughtered would actually be somewhat necessary).