Autopilot is a crucial part of flying a plane. It is used to save attention and energy for the part of the flight where the pilot’s skill and decisions are needed. Wasting that energy during the easily auto-piloted segment of the flight means you have a tired pilot that needs to work the entire time, making decisions.
Think of using a studio pull system like autopilot: you want to have the autopilot on as much as possible, so you can save your attention for items that require it. For parts of your production that are easy to put on autopilot, why use your valuable time and skills to manage them? Default to using a pull system when you can; use push when you must. Here are some examples of situations where each type of system makes sense.