Development isn’t linear. Real life isn’t MLB The Show, where you gain experience and level up your skills. (Is that still how it works? I haven’t played in probably four years, maybe even longer.) In real life, young players go through ups and downs. What you see when a prospect arrives in the majors isn’t always what you get.
Take, for example, Kristian Campbell. After his first game at the major league level, certain radio hosts (who definitely don’t stir up drama on purpose) were calling for him to be sent back to the minors. Two days later, he hit his first career home run and went on to win the American League Rookie of the Month.