I don't like the idea of a healer class in this game, each class already has healing perks so having a dedicated healer isn't needed. Plus the pvp crowd would freak out with all those abilities.
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It's not a dedicated healer, just has some healing components to their kit. Nothing too severe though. Resurrecting teammates is already part of the game, so it's not at if Mercy from OW is being tossed into Destiny :P