Not sure anyone is really mad at them despawning it, more that they had to despawn it because there is something messed up with this fight. There is zero indication what needs to be done. They've cleared the downstairs and nothing happens. They've stayed and nothing happened until 25%, which is insanity, where new voice lines finally happened and then did the downstairs and came back to the despawn. So they're sitting here unsure if the fight is bugged or what order and breakpoints they have to do. So hours doing this for competitors to just instantly know once they figure it out or if its a bug thats fixed.
I'd be frustrated too after they got a raw deal on Azshara as well.