Originally Posted by
VeyaAkemi
So this is my personal take on it, but to me what I believe is seen as the necessity to making Limited Jobs, Limited, is the nature of their progression, or lack of thereof.
You see, the nature of combat in this game is that you are expected to have certain skills at certain levels, and those skills will give you the cumulative power for each level bracket, a SMN at level 70 is expected to do so much damage because it is expected to have Akh Morn at that level, and if for whatever reason the SMN couldn't use Akh Morn(which is possible to not have it unlocked at all, which is why so many people stress the need of doing your Job quests), then it is going to rather dramatically reduce their power output, which makes it as a DPS unable to perform its role.
The nature of BLU, means that you can reach level 80 with a singular spell learned, the one that is forced upon you to start at all, the Job has no progression, any spell could be your second spell, which would make it very easy to find a BLU who is incapable of performing its basic role, this isn't an error, this is by design, the Job fantasy around Blue Mage exists to demand you to go do funky shit, to go out of your way, to get your spells, you can get them at any order, you can select any number of them for you active spellbook regardless of how well they work together.
This lack of natural progression, is what I believe is the reason behind the decision to making them limited, the fact you could get a BLU so bad in a party that the Tank is out-damaging them with autos, everything else, the funky things they can do like instakill effects, spreading every status your heart desires, the sheer power behind them, is the carrot on the stick to attempt to make them appealing despite the limitations.
And I need to stress, to just give BLU a natural progression, for spells to manifest out of thin air, for them to be handed to you through story quests, would destroy what makes Blue Mage into itself, it's the nature of the Job to function the way it does.