Originally Posted by
Kralljin
Have you done LK heroic without a Disc or Spine of Deathwing without a Resto Shaman - before any massive nerfs due to the % (de)buffs?
Simply because there is no specific mechanic, doesn't mean there aren't mechanics that heavily favor a certain class / spec.
Those are the most obvious examples, not the only ones, and yes, those existed in WoD and Legion for example.
Another example are Warlock Portals, encounters such as Jaina, let alone G'huun, without a Warlock would have been a pure nightmare.
Imagine an Encounter like Azshara without a disc - having one disc is absolutely manageable in 20man, a totally different story in 10man, because you only have 2 healers in 10man.
Putting aside that any soaking mechanic were an absolute nightmare on 10man - it was a day and night difference in 10man whether a guy with an immunity or one without got targetted, something that is absolutely manageable in 20 man, because you have more people around to soak or can throw some external onto them, which aren't necessarily available in 10man.