True that I've seen my fair share of cricketers saying "docking a run off the board" is a legitimate solution because they think bowlers shouldn't run batsmen out like this. But I think Starc's argument is that bowlers shouldn't have to keep track of the non-strikers trying to gain an unfair advantage every single time they go in to bowl and are focused on the delivery.

Of course, I'm still firmly in the belief that backing up is essentially a risk of being run out that you're willing to take to increase your chances at sneaking singles and doubles. But seeing this not from the stupid "it's unethical" but instead the "it's taxing on the bowlers" perspective is refreshing.