Originally Posted by
KaPe
Considering that one group is, what, 100 times more numerous? Not really. Then you have raid id, so you can't just keep joining until it dies. Then there's the obvious difficulty gap - outgearing Heroic is trivial. Outgearing mythic? Much harder - and even outgeared, some bosses will still murder you after couple mistakes.
Something like -35% Dragon Soul was "perfectly puggable", because it was nerfed into oblivion at that point. In Antorus case, this is only true if you reword it as "puggable by perfect groups."