We don't know how slow the bar will fill so getting upset about it with a mere 22 hours left is pointless. Just the fact that all the jobs perform a different niche roll in a party situation should make you want to bring as much variety as you can. Warrior will lower damage dealt by the monster and increase damage of plds and warriors. Scholar and whitemage work together beautifully so you should take one of each without even considering limit break. Drg buffs bard's damage so they make a good pair. Blm is the highest single target and aoe damage dealer so it's clear why you'd want one of them. Summoner is able to continually deal damage to a target while burst damaging another (Twintania and Conflag is what I'm thinking of) so that is a plus. Monk is the only one that hasn't been a clear choice to bring to a party because it does blunt damage resistance down, but there are no other blunt damage classes. Maybe with the nerf to bard, people will bring a monk instead of two bards for silence.

My point is that you are going to have a lot better party synergy if you don't have repeat jobs simply because they all function slightly different. Limit Break filling faster is just a plus.