Thinking about Elon Musk building rockets, why is there always a gap under the bathroom door, ignoring privacy? Because humid environments require ventilation; if someone falls, it’s easier to be noticed, and it can also prevent the door from warping due to moisture, making it harder to open and close. At the same time, it doesn’t need to be perfectly sealed, which lowers installation precision requirements and costs. Why does the refrigerator’s fresh food compartment have a light, but the freezer does not? Because the fresh food compartment is opened more frequently; the freezer is mostly drawers and grid structures, which can easily block the light; the low-temperature environment also increases the cost of lighting fixtures and wiring design. Additionally, omitting lighting can save energy and reduce manufacturing costs. Therefore, excellent industrial design often isn’t about adding more features, but about finding the most cost-effective balance among cost, experience, safety, and usage frequency. Many seemingly “imperfect” designs are precisely the optimal solutions under numerous constraints.