Dear Palefox and Trintitans,
it seems i misunderstood your Post, please apologize!
Several Endcontents are tough, as they are concept to be hard and rough. They are made for Challenge and for sure they are difficult. I remember my own problems with my first 2 Toons. First simple dont work as i dont understand the Rules well enough, the second was a not well equipped Shaman with 107 AC, who looses 11 AC after dispel.
So i know the difficulties with Endcontents, but at least and after several playing weeks, dying and analyzing, at least i was able to handle at this time all Endcontents. For sure Eon, DL, BDL and Vault didnt exist at good old days.
We are not Gods of gaming or anything else. We are always willing and glad to help!
None of my Toons is able to solo all on EX, but few can do all EXoff. Thulthanthir, Eon, DL, BDL, Vault of Doom are very tough Areas. I am dying like all other Players too, before i figure out how a new Area works.
To stand Endcontents you really need descent Build, and the mode you can play it, depends much on Gear too!
But without training works nothing, go in there EXoff, play and analyze. All Enemies has Weaknesses and Strengths, try to benefit from the weaknesses. Knowledge of the Enemies and Area is the Key for EX Chellange.
Read my Tactic Thread maybe it helps too!
I think all Players are willing to explain or showing tactics at Endcontents. Feel free to ask!
PS: sry Palefox, simple misunderstood, apologize !