I read this advice years ago and the more I play the more I think this is the best advice for trying to improve your tank rating.
If you have good supports that keep near you, tank is fun. If your moira is in their back line trying to be like tracer or sombras, tanking is misery.
Imo the time to go for a kill is when a squishy is weak and vulnerable.
My frustration is moira’s flanking on the first team fight of a game, when the enemy team is at full strength.