In a world where Warriors get Storm's Path, the highest DPS by a significant margin over DRK and a HUGE margin over PLD, where they have an even huger margin over the other two tanks in dungeons without ninjas, and entirely comparable mitigation that allows them to tank all fights, why wouldn't they be the best tank by a huge margin?

They literally have their cake, eat it too, and get a indespensible debuff on top of that. In fact, people are even trying to spin wariror's disadvantages (Such as the fact it's the ONLY tank that can swap between stances oGCD) as disadvantages which boggles my damn mind.