About IR and unchained : Why is unchained an ability designed to allow us to deal more damages in tank, thus keeping us in defiance with increased damage benefits, and IR is not an ability allowing us to increase resistance in deliverance ?

The fact they both have the same effect, except one is tied to more dps in an already DPS role is absurd. And it would soften the whole "My dps revolves around a 2min timer" if the warrior had his DPS balanced withouth accounting for IR spamtime.