Originally Posted by
Kralljin
People will still look at the setup of these guilds and try to copy that.
Obviously, not every KJ kill will feature 5 rogues, but you're still going to see something like 2-3 Rogues per kill for quite some time, Gul'dan had a similiar thing.
The problem is simply the recurrence of this.
Almost every single Raid tier in the last years had at least one *difficult* encounter where having an immunity was a major advantage.
It simply has a serious effect on how people build their raid, having an immunity is good to have "just in case", past has shown that those abilities can seriously reduce the difficulty of an encounter, so people want to have a lot of these as long as it doesn't cause serious gearing issues.
In my opinion, a big issue is also the fact that Blizzard has given a few specs the ability to deal with heavy movement, while others are just left in the dust.
Take a hybrid like Ele or SP, they aren't nearly as mobile as any Mage spec.
The ability to deal damage while moving is simply essential on difficult encounters, a spec that cannot properly work during these situations won't see much use unless it's somehow required for another mechanic.