In economics, we introduce simple models that assume inputs are identical. That is, all workers are exactly the same. Is this a realistic assumption? How might it be harder to focus on specific aspects of models if we are worried about different talents that workers bring to the production process?
Answer: The assumption is not realistic. But once we master the ability to look at very general differences (such as between labor input versus capital input) we can look at more specific differences (such as between a managerial worker and a production worker).