Roles for Samurai, Red Mage, Dancer

[Shippuu]

Are you sure? Gill toss is a recurring Samurai ability. Sounds more like something a Ronin would you. And as you never fail to mention whenever I bring up my wish for an Othard based expansion that Doma was burned to the ground, so any samurai trainer, especially one that is far away from his homeland, would very likely be a wandering sellsword. Also, one of the most beloved samurai stories IS the story of the 47 Ronin, who avenged their lords with good old fashioned murder.

There's nothing about Gil Toss that dictates any kind of Samurai Archetype. It's simply a move that's a somewhat staple in Final Fantasy Samurais but also isn't restricted to Samurai. Everyone's job in this game murders so your 47 Ronin example is a pretty poor one, especially since it's a story about loyalty, honor, sacrifice, and persistence, all traits you'd look for in creating a good tanking identity. They are themes a DPS can have as well, certainly, but they fit a tank role better.

throughout the series Samurai's main thing was doing horrendous ammounts of damage. Heavy armor or no, it was the most DPS of DPS classes.

This is just demonstrably untrue. While Samurai have been strong DPS in past games, they are hardly ever the DPS of DPS classes, and often had stats weaker than jobs we have as tanks now such as the Knight class. Most of their "damage" is in the form of instant kill abilities which will never appear in an MMO anyways. And even IF this was true, you know which job has usually always does even more damage than Samurai and has a bigger identity of being offensive based in every way, shape, and form? DARK KNIGHT. And yet here we are with DRK as a big bad tank.

So your argument is pointless. DRK has always been super offense orientated, moreso than Samurai has, as Samurai has had many identities across FF games, some being very support orientated. So if they can make DRK a tank, then arguably it makes even more sense to make SAM a tank too.

Or we will get a dexterity based evasion tank that will wear gear that looks nothing like this.

Evasion tanks would never work in this kind of game without being horrendously underpowered or horrendously overpowered. The style of mitigation in itself is asking for a balancing nightmare and is thus highly unlikely to be considered. On top of that it is also highly unlikely that they will create a new tier of armor just for a new tank. It'll either be in fending armor like the rest, or share gear with a DPS which isn't a very solid idea in and of itself.