Well one thing can lead into the other over time. If you can lift 405 once, 315 for reps becomes pedestrian and 225 becomes boring. Lifting that much weight will turn you into a monster faster than if you had not pushed for that capacity. I've seen people who can treat a 225lb barbell as if it's unloaded and 100% of them look like dragon ball Z characters.
Well one thing can lead into the other over time. If you can lift 405 once, 315 for reps becomes pedestrian and 225 becomes boring. Lifting that much weight will turn you into a monster faster than if you had not pushed for that capacity. I've seen people who can treat a 225lb barbell as if it's unloaded and 100% of them look like dragon ball Z characters.