Some cooldowns require Defiance to use, but we can stance dance to Deliverance once triggered to still get their full effects, and the amount of ways we have to mitigate as Warrior is unbelievable. It's not as cut-and-dry like with Paladin.

Then we have strong cooldowns that don't require a stance like Thrill of Battle which can actually mean having "Defiance" -5% HP while in Deliverance. Pairing that up with Inner Beast 20% mitigation/damage/self-heal for-example before stance dancing, and with proper skill play a healer likely won't notice much of a difference. Warrior could then next infuriate/build more stacks then fell cleave/decimate the living crap out of the mobs, burning things faster.

Plus three of our cooldowns give a wrath/abandon stack, so the job skill set is promoting cooldown use if you want to do some serious damage and mitigation.

I will say though a Warrior has no one to blame but themselves if they die in Deliverance without a cooldown to compensate for the lack of Defiance. The healer is likely trying to heal you but without the Defiance healing buff, one should mitigate their HP levels.