Originally Posted by
Shurrikhan
There's actually absolutely no reason that would need be the case. Class balance is not held tightly over the leveling process; it's content to simply be tight enough that no one flies off in a rage. What would it matter if the BLU didn't seek out situational ability Y before going into Bartam's Mettle? The difference between a decent and slightly-above-decent BLU is already going to make a larger difference than that skill would. Balance only really becomes a thing at level cap, and so long as there is a fixed total arsenal of spells, the methods of acquisition are largely irrelevant.
The reason you're likely not to see BLU receive actions by alternate means is because there's little exciting alternate content in which to set those methods of acquisition. If a BLU were able to fight a mob well above their own level to receive an action "early", the issue would be less one of balance as, in the process of getting some friends together to go and get the skill from elite mob X, one is left wondering why the open world feels so damn barren.
The systems remain rigid and stale less because they have to as simply for fear of the can of worms opened if the game exposed how much of itself has been left undeveloped, how many opportunities are skipped. It might not take a meteor, even then, for XIV to exit its contentedly sheltered state, but it will at least take a crafty sequence of improvements, each seemingly beneficial in its own right, that each prototype and move towards some far more fleshed out state for the game -- filling in without exposing the voids.