Not for simple mistakes no, but often you will spend much more time trying to fix something than if you started over. And all the while you’ll gain a lot of speed and you’ll start judging with much more accuracy how to approach something at the beginning, so you avoid a fatal mistake later where changes are more painful. Because you’ve already been down that road and instead of staying on it until the painful end, you decided to turn back and saw what the correct way was, and the more you do it, your foresight on situations will improve tremendously.
