Most of the English speaking world would call what has been labeled as avoidance as mitigation also.
Not exactly. Mitigation is consistent, mitigation is absolute--at least within the realm of physical damage as it relates to WoW. Avoidance, with regards to WoW, cannot be described as such--avoidance in WoW is dependent on RNG. It either works, or it does not. Yes, you can increase the likelihood that it will work, but it will never work consistently or absolutely.
Admittedly I'm not as knowledgeable about the current state of Block and Warrior/Paladin Mastery in relation to block; so I'm not sure where that would fall.
In any case, I'm really not interested in debating the supposed etymology, terminology, proper usage, or common usage; and virtually none of this addresses any of the prior points made at all.
Haven't done that yet, but if he doesn't have abilities that two-shot tanks, then pure EH stacking isn't preferable.
Doesn't look like you've done much of any new content.
In any case, this is illogical. Your reasoning here is that just because a particular encounter may not have an ability that can effectively 2-shot a tank, avoidance must necessarily be better. First and foremost, you're operating under the assumption that there is no such ability. Secondly, you're suggesting that an absence of such an ability necessarily makes avoidance more beneficial. Neither of these suggestions are compelling or reasoned arguments I'm afraid.
In actuality, many relatively known bosses seem to have abilities which cannot be 'avoided' via dodge or parry; in fact, I'd be interested to know what significant boss abilities can be avoided via dodge or parry, if there are any. It stands to reason that this trend will continue throughout the expansion--at least for the most part. Further, this point is also rather apparent as it relates to Heroic Dungeon bosses as well.
So, while there may or may not be abilities that can effectively 2-shot a tank, avoidance remains largely irrelevant with respect to what abilities these bosses do use. If this is true, then avoidance really only holds potential benefit in cases of multi-mob trash; and even then, as we found earlier, this isn't even an absolute or consistent benefit.
So again I'll ask, how is avoidance necessarily "king" while EH is necessarily "dead"?
Thank you Victoriaaz for answering the questions in the OP. I'm curious to know why there's such a disparity with Druid tanks, based on your experience. Is this mainly with regard to trash groups, or bosses, or both?