In the context of the article, I think the justification was: assuming you're more productive in quality and not quantity, because you're working towards ambiti

In the context of the article, I think the justification was: assuming you're more productive in quality and not quantity, because you're working towards ambitious goals, then on most days you will not complete a recognized goal. The suggestion is to go out of your way to recognize your smaller day-to-day accomplishments which help you reach the big goal.