Drk can still be in both stances at the same time and has the best, most consistent AoE, War will be able to do 6 Fell Cleaves in a row, and Pld gets a magical nuke while being able to shield (Divine Veil) and cover the entire party while taking 0 damage. All these are still exclusive and defining characteristics of each class.

That's just off the top of my head what each tank does wildly different from the next, let alone anything else. I don't mind the basics (Base level Mitigation, oGCD stun) being available to all tanks. That's how it is with healers already and is being done to DPS. It actually is just a very simple way of evening the playing field between jobs.

Give it time. We Pld lovers and mains will be the butt of many jibes once more in no time.