I'm imagining old-school, tradition RPGs on a table-top and the discussion 'the players' would have oppose to the discussions we're having today,looool! When a DEV team makes a game, there shouldn't be any hole or pit falls(unless it's intensional for expanding on). I'm not sure what they're thinking if the role we the players are suppose to take are flawed(as the everyday discussions seem to be taking it).
...Or are we as a community wrong or misunderstood on their idea on how us the players should play their concept of a 'real tank'? Remember, the focus of a RPG is to tell the story and this MMORPG was intended to still tell a story with all of us involved. 'We' are just able to choose our roles of what kind of hero we ought to be(from what we desire) and what paths we want to take.

Anyways, putting a Paladin and Warrior side by side to study what makes them different, I should basically say their "roles". One is offensive and the other is defensive but you knew that already, didn't you?
NO simple way to solve which is the preferred "tank", everyone just have to choose on their own style. It's a ROLL OF THE DICE... As simple as who the mob decides to HATE MORE, it's a ROLL OF THE DICE.

I just think we as player can influence more the "odds of a dice roll". *If the Paladin could influence more hate while still taking more damage than the warrior, that would be the "perfect tank", (he shouldn't have to deliver more damage to gain more hate but that helps). More equipment for the Paladin with greater DEF and EMNITY, that's what makes a Paladin special( and it should be more shinier too!).