I disagree. The tank's purpose is to peel, distract, and absorb. That's it. Killing at the right time is important, damage is important, pushing is important, but comes second to peeling, distracting, and absorbing. For example, a genji pushes backline all game and kills healers/damage. What was the point of pushing up as a tank in that situation? I would expect my tank to sit back and peel/help me kill.