The unmatched ability to survive clearly means other classes don't achieve Warrior survivability rates vs. the most brutal mobs. In short while content is current knights are more likely to die than Warriors when tanking raid boss mobs. When a guild can have knights tank every event in an expansion that representation made to Warriors is clearly not being kept. The Phase 2 Melee Update which was ultimately canceled had quite a few outside of the Tank Archetype abilities. Devs stated it was to close a utility gap that had become too wide/knights would not be getting upgrades in compensation.