once one is uncrushable, health becomes the weak link
spells ignore armor, block only mitigates so much, and there are multiple boss encounters (kael'thas' 4 lieutenants, first one at a time, then all 4 at once) where a tank may die and you gotta taunt him off a caster and tank 2 bosses while the tank gets rezed (most likely druid or darkmoon card: twisting nether, remember warriors dont have mana pools and ill take a combat rez and some extra workload over a full wipe and raid boss despawn anyday) and rebuilds threat
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