Reading through this thread I don't think the OP understands the fundamental nature of this game: gross vertical progression.

Please note that people doing speed runs on the current 'hardest' dungeons (those in Expert Roulette) are doing them often in i110 or higher gear. These are dungeons that are tuned for i90 gear. They are completable in the game's original set of 'best' gear (first coil and capped tomestones). Think about that a moment.

You see people doing these huge pulls because the tanks have multiple thousands of HP more than the dungeon was tuned for, because healers have significantly higher output, as do the DPS. Try to do a big pull with content appropriate gear and then you can complain about broken trinities.