Originally Posted by
Nitros14
Mechanics aren't what keep things unkilled a long time. Tuning is. Mechanically complex encounters that were mostly execution like mythic Gorefiend, Xhul'horac, Thogar and Imperator Mar'gok died real fast.
Method and Paragon didn't take 9+ days to kill mythic Archimonde because they couldn't not cross lines, figure out which stack to go to with mark and taunt infernals away from each other. They took 9+ days because the numbers were grossly overtuned for their gear level and the margin for error was near zero.
Hell the level 60 Heigan dance is a lot harder mechanically than Seething Corruption. Figuring out how to do your group and tank rotations on Four Horsemen and then executing it takes some real thought.
Players have so much more to work with now too. They don't have to worry about threat, or aoe threat. They have things like misdirect, tricks, bloodlust, a million personal defensives, raid cooldowns, tank cooldowns outside of a 30 minute shield wall, stampeding roar, aoe healing, personal sprints, cheat deaths, death grip, mass death grip, ring of frost, mass entanglement, passive cleaves, every class has aoe, 30 yard range taunts.
In a way that adds complexity and lets encounters be more complex, but without all those things a lot of Naxxramas mechanics start to feel a lot more scary. To pick up a Guardian of Icecrown at 60 a tank had to physically walk over to it and use his melee range taunt on it (that had a 15 second cooldown). Now he asks a hunter to misdirect it to him, or throws his shield at it from 30 yards away or taunts it from 30 yards away or charges it. To heal a melee frost blast at 60 without losing them you either had 3-4 priests Prayer of Healing a melee group and hope you got them or individually heal all of them within 4 seconds, now one healer could just hit an aoe smart heal on the group and none of them would die anyway because a disc priest would've preshielded them.
To build threat on multiple adds at 60 you had to individually target and hit them all and they'd easily get ripped off you, which made fights like Gothik a horrible mess where you couldn't just aoe everything and had to CC things to keep up.