Originally Posted by
Xeia
I'm always surprised how many people I see advocating this idea. While it looks nice on the surface, I can't see it working fairly without a complete overhaul of the way classes and jobs are currently set up. To follow your example, let's say I'm a level 50 BLM but have never touched NEC. Now I go and unlock it and all of a sudden I'm a top level Necromancer. Why is that a problem? Other than the fact that the two jobs would be strikingly similar, balancing issues between classes.
Continuing with the example, we now have two full-fledged jobs stemming from Thaumaturge and tied in levels. That means that leveling THM is more worthwhile than leveling, say... ARC. How do we fix that? Well, now let's make ARC split into two paths too. BRD and... I dunno, RNG. Now we're in a situation where in order to make each class tree equally useful they need to think up two jobs for each class they add. People are already worried that the armory system limits the introduction of new jobs because they have to think up a new class for each one... and while the suggestion you gave is often cited as a fix, I think it compounds the problem. Think of SMN. What on earth could be its partner job? Arcanist really can't go into anything other than Summoner because it uses Carbuncle.