There's a new philosophy in Wrath
(actually, already here in the post-3.0.2 world
) when it comes to who you should bring on your raids. In short, as the headline says: pick the players you like, not the classes and specs you need. In all of WoW
until this point, there have been certain specs that were virtually required in various parts of the various raids. Which specs these were has changed with time, but think of Shadow Priests' mana battery capabilities, or stacking Shamans to get many Heroisms
/Bloodlusts. To be a cutting-edge raid it was simply required to prioritize "correct" raid composition over other factors. Yes, your players needed to know how to play their class, but beyond that, you took what was needed for the fights you were doing. And you took a Warrior main tank, generally speaking.
All that is set to change forever in just nine days. Now the classes are much more interchangeable with each other than before. Some prominent buffs have been nerfed, and in one notable case, distributed: Shadow Priests
, Survival Hunters, and Retribution Paladins all give mana back with Replenishment
. In general there is more than one class that can provide most types of buffs and debuff. Also, many buffs that used to be group-wide are now raid-wide, such as Paladin auras and Shaman totems. This makes it much more likely that picking two tanks, three healers, and five DPSers out of a grab bag will get you decent coverage on buffs and debuffs.