How I see tanks in ff14 is that the original purpose of dps stance was more for singular questing and existing in the overworld and not taking an hour to kill a mob. Naturally the community has since latched unto off-role dps as a required function of the game. And i don't blame them one bit really, there isn't anything to do after threat is maintained and a tank buster is mitigated.

The direction I hope square goes is to leave dps stances as an overworld mechanic and to add more engagement and effectiveness in the form of interesting/and or utility combos. Thinking things like, a combo finisher that would make the next 5 instances of damage on a boss not your own deal additional potency. Actively spending gauge to implement a more powerful armorbreak, or grant party members buffs. Things to do that net more group damage or survival while being intuitive with traditional tanking.