the tank changes wouldn't work, it'll require SE to change the Primal fights completely, or even all the end game fights, but it doesn't matter since when the instance hard enrages you are going to die regardless. IE: Twintania will just spam Aetherial Profusion endlessly if you don't kill her in 12mins, no amount of Tank LB will save you from this, unless they add a pseudo invincible/invulnerable into the Tank LB...