Quote Originally Posted by Demonjustin View Post
It could limit it by having some abilities so powerful that they become expected. For instance how THF used to be expected to /NIN, or how any single-handed job in the game is forced to /NIN or /DNC to DD well due to needing Dual Wield. Once you have such powerful things such as Dual Wield that you can only get from certain sub-jobs, it becomes a near requirement to have it.
They can balance every combo job JA to a point that every combo JA are equally useful in every situation. But knowing SE it'd require too much resource for them. It's hard to balance 22 jobs without worrying about combo JA, let alone balance 22 jobs WITH different combo JA.