Unfortunately, I think this is a total pipe-dream, partly because of the player base. If the jobs aren't exactly equal, there will be those who want only the best, no matter how small the difference. If one job does 10,000 dmg over the length of the fight, but another job does 9990 dmg, they won't want the weaker job. I mean, that 10 point difference might make the battle last a minute longer. Seems people only care about having the quickest, safest, and easiest path to a win and don't even want to try something different.