There is just a lot more to do for a Healer in Wow and for Tanks the Same. Thats why noone espects them to do sick DPS. I recently started to Play WoW again because of the Destruction of FFXIV pvp with 4.0 and its so much more chilled there when it comes to Raids or Dungeons. It kinda feels like all the toxic Players from WoW moved to FFXIV.