I have put out power set change ideas before and used my min max builds to prove a point on AT balance when talking about ice Armor. I was pretty much told that the Devs do not balance this game going off min maxed builds, so my argument was weak. I could respect that so I left it alone after that since the whole basis of my argument was coming from comparisons between different Tank sets and the stats of those sets after being min/maxed.
So I am taking this in to account when I say, an all Defense Tank with almost no Resist to show for it will get slaughtered in say...the ITF and any other mob that comes with a hefty amount of -defense. EA only comes with (correction) 51% Resist to -Defense and that is only at level 50 and that does not go any higher if you slot it. Granted, 51% may sound like a lot, but it doesn't take much to wack your defense down to the negatives with multiple stacks of -Defense. Now, if you pick up the T9 you get another 34.6% Resist to -Defense, however, almost nobody picks up the Tank T9's these days and even if they do, that won't help much against mobs that stack -Defense.
SR can pull it off because they have a TON of -Defense Resistance. And since we can't use Min/Maxed builds when discussing these types of situations, I try to keep that in mind when I say that EA on a Tank won't be anything like what people think it will be.
I'm all for it though, hell, maybe I am wrong and just thinking in to this too much, I would love to test it out for myself and prove myself wrong.