I like the idea, but it's a lot of busywork for marginal reward in the end. It's like the Crystalarium in FF13-2. There are large nodes that you can assign specific classes to in order to boost stats, but in the end focusing on something like commando for all the big nodes only increases your max strength figure by like 25-30 in the end game, which is about 3%. It's a lot of work for not a lot of payoff.