DPS needs hit to top the meters certainly, but the difference between most healing and spell damage gear isn't "as huge" as going from spell damage to agility / strength gear.Originally Posted by AetherMcLoud
Hence it's easier to switch between those specs if purely for the intent of going for 6-8 healers on a boss and having the others help damage the boss.
Gearing up OS is a lot easier that way, you only need to swap out 2-3 pieces of kit to be able to maintain a respectable spot on the meters.
Whereas otherwise you're looking at replacing 10-12 items that serve absolutely zero purpose in your offspec otherwise.