I would totally disaggree on the tank thing. I think its pretty much common sense that primary stats for a tank are 1) damage reduction and 2) HP. There is no better way to mitigate dmg than by those 2 stats. Forget shield and defense chance since they will not mitigate consistently. A tank stacking endurance, thus increasing his HP is doing the exact right thing. Hence your reasoning is pretty much off-base.
Getting off the main topic, but you just agreed with me. Mitigation is #1, Hp is #2 priority. A very nicely done analysis here on MMO Mechanics that shows just how much damage is reduced by shield/absorb.