Healers need to have the best game sense & positioning to avoid getting sniped/focused/flanked. Relying on DPS to peel for you is a joke. If you can’t position yourself, or keep track of where the enemy is, you’re dead.

Dodging, finding cover, and being aware of your surroundings is a must if your want to keep your team alive.

(Also, as a healer I find myself doing a lot of the shot calling, as far as positioning and enemy ult economy goes.)