No, I didn't.
You clearly are saying that there is a problem with unsynced running of it because the Blue Mage will be just a dead weight. If there is no problem, you wouldn't have used this argument against the job in the first place.
I never said about you have problem unsyncing anything else. Just where it is relevant for Blue Mage.
Only here you are saying that the problem is supposed to be that the Blue Mage himself may feel troubled by having to unsync run it to learn the skill. But you know what?! A blue mage is not a dead weight to himself. He's not a dead weight if he's in a content that is properly leveled to him. So yeah, this is not what you said before.
I'm going off entirely what you DID say. It's the exact opposite of making stuff up. I did not try to read between the lines and make up stuff. If you are troubled by it, write out your arguments clearly the first time around.
You are again making assumptions. Except for the few high-level bosses, all other skills are likely to be available from overworld or stuff that lvl50 can solo unsynced anyway. As for the high level bosses, it may be soloable as well, depending on the skill choices available. Big Guard, White Wind, that stun, Bad Breath, all of these skills are not specified. Yes, I do not expect Blue Mage to be able to solo Shiva, Ramuh etc at lvl50. Certainly not the extreme versions. Titan is unsoloable in hard mode since I don't think it's possible to kill him before he uses that Stone Prison and in Extreme Mode it takes too long to burst and deals too much damage for a lvl50 to realistically survive it, even if overpowered. But for all we know, Blue Mage may have Angel Whisper with its traditional re-raise which could count to save a wipe. So even that would be no problem.
Do you notice the "for all we know" part there?! There is a lot of possibilities. This class does have potential to be able to solo ANYTHING in the game. Because Blue Mage may have access to skills that are just that broken...even aside the Lvl5 Death or Roulette that would be just unfun, but good for farming. We know he can stun a primal. We don't know whether that stun is spammable, whether it's long, whether opponent builds resistance to it, whether its costs exceeds the Blue Mages ability to regenerate mana etc. We don't know whether Bad Breath will work fully on all bosses...while it's a ridiculously broken skill if it will. That's a lot we don't know that may end up either way.