I think it must be the BRD as many ppl have said that BRD is the only irreplaceable DPS.
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The fact that they can DPS quite well and offer support abilities. BRD. BRD every single time.
High Voltage is being cast? NOPE. BRD silenced it.
The bad healer who can't manage their own MP is under 1000MP? The BRD dropped their own DPS by casting Mage's Ballad to help the terribad healer.
You have 3 BLM or 3 SMN in the party, how can you speed it up? The BRD casts Foe Requiem and boosts the damage of his magic casting allies at no loss to them self.
The support they give could be better *cough*moresongsforallcircumstances*cough* and a lot of BRD players need to utilise their songs better, but I'd always pick one over a MNK, DRG, SMN or BLM.
In a perfect world though, a DD setup would be; DRG, BRD, BLM/SMN, BLM/SMN. Why you ask? Disembowel from the DRG gives the BRD better DPS and the BRD's Requiem gives the BLM/SMN better DPS. It's a nice little happy bunch of helping each other <3
I do agree however that brd in general is the most wanted dps in general because of their versatility with dps / utility.
Bard without a question
Summoner next because of battle raise.
1. BRD (Silences, and Resource Management)
2. SMN (Res, Damage Mitigation, DoT (theoretically, in ideal situations, I only lose the dps of one ruin while ressing someone if I have all my DoTsand swiftcast up)