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Such as?
..everything? Any adds in the first phase, the MC has a large amount of important people it can pick. Since you seem to think defile and the disease are so "OMG", then KT's Mana Detonation and his Void zone are easily included. His ice tombs will instantly destroy the raid if someone moves wrong and begins an endless chain of it, considering how small the room was and the fact that AoE healing back then was practically non existant.
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Mind control is a stereotyped mechanic used on countless encounters and polymorphing a hapless MC is a lot easier than moving around with debuffs. It's easier precisely because it's not anyone's responsibility and not something that can be fucked up short of failing at pressing the sheep button which is no different than on any other encounter with an MC, or even trash in fivemans. KT MC'd how many people at once - four? - and 40-man raids typically included how many mages, ten? If one mage has brain aids there's five other mages to cover for him.
Someone already gave you a pretty good response to this, but whatever. His MC is the worst of any encounter in the game. It MCs an 8th of your raid including your main tank in an era where raid bosses weren't tauntable, and MD didn't expect, so DPS had to stop on a dime. If he mc'd OT's in the last phase shit could hit the fan very quickly. Kickers getting MC'd, although you would generally have some backup unless they got tombed.
It is nothing like Arthas where everything is predictable, other then who gets grabbed by the valks. You know exactly when defile is coming, when birds are coming, when frostmourne room is inc, soul reaper, etc. KT used his abilities whenever he wanted and more often then not, he'd cast them back to back. This is in an era of the game where every class didn't have every oh shit button available.
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And we go back to the WMOs - that includes very nearly everyone both you and I raid with, because obviously none of us are that good, to pull those numbers. We're wearing essentially the same gear and have close comps - they're just better.
Which has nothing to do with the difficulty of the encounter, it's just the playerbase. You claimed this is the hardest boss ever, I said it isn't.