I've mourned the Blue Mage already - it will be what it is going to be at this point. They have put too many hours into its development that even with a large outcry, it's still going to go forward like this. There were some straight up bad decisions made about it, and no amount of yes-men will change that. I genuinely and truly hope this Limited Job flops and is a miraculously negative mark on the choices of those that implemented it - because I wholeheartedly do not want to see other jobs show up as Limited.

Introduce job specific additional content? YES.

But you can't play that job in current content - whether it be dungeons, raids, etc - NO.

There is absolutely no reason why Blue Mage could not have been balanced with its numbers and abilities to work fine in current content and DF an ALSO add on the Masked Carnivale. None. They just CHOSE to not do that. They could add on specific bonus content like the MC to OTHER jobs as well - have a special tankish one, a healerish one, etc.

Warrior - Gladiator style combat with random npc matches, where victory streaks nets you rewards. Bigger the streak, better the rewards.
Monk - Boxing matches. Cup style bracket. Could even do Quick Time Events vs other players or npcs.
White Mage - Doctor Assistant in the Reach. Make theirs actually to do with healing. You assist the medical staff in Rhalgar's Reach to help cure and heal the patients to get them on their feet again after a rough battle with the empire. More and more are brought in and you have to heal/esuna/sleep/etc on the npcs. More and more come in until impossible to keep up - where you 'collapse with exhaustion' - and the number you helped is your score. Higher scores more rewards, leader board even.
Machinist - gun range / skeet shooting for high scores with varying difficulty in thrown objects.
Bard - Perform plays via QTE/Duty Actions.... Of 100 Nobles, 73 were impressed.....
Red Mage - Same as Bard - Perform swordplay via QTE/Duty Actions.... Of 100 Nobles, 73 were impressed.....

Those may not be the best ideas - but that's from one person off the top of their head while at work and not giving it full thought - let alone someone who does this as their full time job with a team of people.

And adding any of that in no way means they have to take away from what those jobs already are.

I am thoroughly disappointed in these people that they not only took this route but continue to spin it. Don't tell me to not like something before I try it.

This is 10 people at a table ordering cake - 9 were served with cake, and pie was served to the 10th. It may be good pie - it may even be great pie - but it is not and never will be cake.