This game is easy to balance because the jobs and gear are horribly simplistic with virtually 0 room for customization. As long as they stick to this model all they have to do is adjust potency of dps abilities slightly now and then to keep them in the same range. Same with healers and similarly adjust mitigation %s to keep tanks equal.

Instead of complex gear/stats and unique jobs (like Xi for example), we get simple cookie cutter jobs and gear and the complexity is bound to the encounter. Every fight in this game is wildly different but the classes and gear don't change instead of the other way around. It works, but I still miss the element of player controlled complexity. Charactor development now is nothing more than get higher ilvl gear. The upside is it makes balance much easier to maintain because players don't have the freedom to create unorthodox gameplay. As long as they stick to the Holy trinity and simple jobs and simpler gear balance will be easy, for better or worse.