>Now do 0 reps to failure

A single, continuous set taken to momentary muscular failure inroads more efficiently and deeply, resulting in a higher intensity of effort and far greater time efficiency than multiple short, disjointed sets of the same exercise.
With Multiple sets, you are retracing the same motor unit recruitment sequence, not providing any additional stimulus for growth; instead, you're only increasing the exercise volume and the demands on your body's limited resources for recovery and adaptation.