The thing that doesn't feel heavy becomes easy to operate only when it's in hand.
Once it's not exhausting to hold objects, it becomes necessary to think about what the main purpose of holding them is.
The Mirror Assistant is an important supportive force for the Chief Surgeon.
What does the Mirror Assistant assist with? Teacher Tan mentioned lighting, which she could understand as the surgical field. As long as it's the surgical field, it can be likened to the traditional surgery's use of retractors, which served to expose the area of the operation for the Chief Surgeon to see clearly for cutting.
The difference is that retractors open up a visible area within the human body, which can be directly enlarged. However, the area exposed by laparoscopy is only a small ellipse, which means that the assistant has to compensate by mentally reconstructing the entire surgical field for the Chief Surgeon.