what? thats far from true , healer have to know to time Cds to avoid wipes , and have mechanics aimed at them , same goes for tanks.

dps is important? yeah but i dont see how tanking or healing is "less" important , w/o good tanks u arent going anywhere , and withouth good heals good luck not dying to any raid wide aoe...

U need to kill the boss , but in order to do so u need to do some scripted mechanics 1 (that goes for tanks (adds , stacks , moving the boss ect) , healers (aoe dmg , mitigating big attacks... ) and dps (burst phase , adds to kill ) or all the raid that needs to dance around to avoid mechanics )

Some tanks healers prefere to only tank or heal , others dont mind dpsing in some phases.... to be fair dpsing for a bit spice it the encounters