Having also just come (back) from playing some WoW, that was also a DPS-centric meta? It just didn't matter because tanking and healing involved more actual time dedicated to them that getting to DPS was a luxury. XIV is very spiky so you have a lot of time with fuck all to do.
Personally, I'd shuffle more skills behind the tank stance so you're tied to it when actively tanking. To compensate, more reactive things when actively tanking to make up for the flat damage loss. Meanwhile, OT stance has more responsibility in our relevant tank debuffs as well as the base higher damage. Then we can start worrying about more maintenance damage on the tanks and less just big busters.
This isn't quite true? They do less damage but they're also objectively the worst tank when it comes to the fights as they're designed: Their cooldowns all sync the worst with the fights. In the super fast kills with no padding, PLD will actually do pretty okay vs DRK when it comes to damage output. They're just going to be worse at actually taking damage AND worse at helping raid wide damage (unless you have a MNK but then you're also lowering rDPS anyway or going triple melee) as well as worse utility provided in things like ranged AoE pulling, AoE damage, mobility, etc.
I was really hoping for SAM as a tank if only as being able to go "Okay, they have a plan for WAR having OT on lock!" At this point, I'm left just going I hope they're completely overhauling existing systems instead of just bandaid fixes like VIT over STR as our primary stat.