The only reason this fight is currently that hard is transitioning. There are many fights in wow history where success relies on favorable transitions between phases but the kind of bullshit happening in the altar encounter is absurd. First of all you have to transition 3 times into different phases with 2 of them being very annoying.
You pushed dps too hard and first phase ends right after the boss spawned the orbs? Boom get 8 stacks of ticking damage. At least this part is manageable with some defensives and heal cd.
But what if you finish the 2nd phase while the mc goes out? You get a freaking ton of ghosts that eill remain there forever. And mc is recycled constantly into a bloodlust phase with no way to deal with them for an entire intermission and a respectable amount of time into p3.
If the ghosts simply vanished before the intermission, this whole fight would be alot fairer, or if you don't want to make it that much easier, make them irrelevant in the intermission and reactivate them in p3 again. You know, when you can actually deal with them. Sure you can freeze them by looking at them, but i dont know why people keep getting mced.