the trouble is not really that T5 have complicate mechanic, it's the lenght of the fight and more bad, the difficulty curve in comparaison of the rest of BC before this fight.
and there i'm sorry the difficulty curve of T5 is simply ridiculous when you look at what you have before, we pass from at some boss that are hardly difficult, it ask to be reactive and follow simple pattern at worst the boss have 2 phase (cad)... and T5 ? 5 phase tons of mechanic that simply insta kill you! even in i300 gear with an echo +100% you will simply die! and that where the game fail miserably.

instead to have a progression curve balanced we do have a skyrockt difficulty in comparaison of what we do have before. for all the one saying after is harder, indeed it must be harder, what the point if not. the trouble it's what you have before! redo this old content, and admit that in comparaison of T5 it's a joke!T5 need to loose a lot of the One Shoot mechanic, only this will make the fight more accessible.

One shoot mechanic like enrage have them place, but seriously, make a boss that can simply one shoot your 80% of the time is not fun... where is the thrill to survive it attack to survive to the challenge... god explain me why this idiot don't simply chain her one shoot mechanic for kill us!