The article emphasizes the importance of asking "why" in software engineering to uncover deeper insights and better design decisions. By re-evaluating a simple requirement for file storage and search in AWS S3, the author explores various approaches and ultimately settles on an efficient solution tailored to user needs, demonstrating the value of understanding context over merely fulfilling tasks.

Effective system design is crucial for creating scalable and reliable software. Key principles include understanding user requirements, ensuring flexibility, implementing proper architecture, and considering performance and security. By adhering to these guidelines, developers can build systems that are both efficient and easy to maintain.