The Grand Steward asked Zigong: “Your master is a true sage, isn’t he? He is skilled in so many things.” Zigong replied: “Heaven indeed made him a sage, but he also happens to have many different skills.” When he heard of this, Confucius said: “What does the Grand Steward know about me? In my youth, I was poor; so I had to learn a number of lowly skills. Does a leader need to have so many different skills? No, he does not.”
As a young man, Confucius had to take on a number of minor clerical and book keeping posts in order to support his family.
Despite his protestations here, I doubt that his “real world” experiences did him any harm. Indeed, they probably made him a much more well-rounded individual.