Dancer (DPS Concept)

[kikix12]

Well, you know, you got a Bard that has a defensive cooldown and some defensive abilities and a heal, Machinist that also has Palisade(...)

Both palisade and the heal can only target others and have pretty long cooldowns. They don't make them "off-tanks" by any means. Any healer is closer to being an "off-tank" thanks to their low-cooldown shields than any of the existing DPS.

(...)Red Mage that everyone takes as a revive tool that can also be semi filled with Summoner, of which the summoner can also use Titan-egi to tank to a degree, all the healers are DPS to begin with, and Paladin can heal as well.

At higher levels titan is useless. When a tank in my party went away from keyboard at the start of the lvl61 dungeon, the summoner brought titan egi for the very first group of three. Not only did it die quickly...but it couldn't hold aggro for more than few seconds. A good, physical DPS will be a comparable tank to titan, if not better. Paladin cannot spam the heal. Due to its cost it requires them to restore the MP with combat skills. Red Mage CAN spam its heal, which is also pretty decent, but it was put there simply because of the theme. Red mages are red mages because they dabble in both black and white magic. Hence why they were given a decent heal. But only one, and it's not good enough to save from any major mess-up in harder content. On the other hand, Red Mages are very straightforward with only one innate skill that's not a straight-out damage skill or a self-buff related to their damage mechanic (yes, yes, there's still "Tether"...but yeah).

And healers are not "DPS to some degree". You seem to not understand the difference between "being" something and having "some" tools. Healers have maybe five or six damaging skills, out of which maybe three can be regularly used without drying them off their mana or being on cooldown. They merely have DPS because otherwise they could not play solo content.