Stam stacking is part of having a large EH. Same with armor.
Blizz is steering away from avoidance since the values have become so inflated, otherwise the ICC debuff would be unnecessary. Avoidance (miss, dodge, parry) is a part of damage mitigation (miss, dodge, parry, block).
Cata tanks will see more stam/armor on gear and less avoidance (much much less % per rating than now).
Please stop being dumb.
So requiring 100+% mitigation for ToCG-25 Anub is a completely myth? Some top-end guilds are still farming some Uld and Uld-hardmode bosses for specific pieces for avoidance/mitigation, are you telling me they are all dumb because they don't simply stam-stack and nothing more?