The author reflects on the importance of balancing design and engineering in product development, citing Aristotle's concept of the golden mean. They argue that designers and engineers should pursue their individual interests to achieve a better product, rather than compromising at every stage. The author shares an example of how their company successfully integrated design and engineering teams, where designers focused on user flows while engineers prioritized functional implementation. To achieve this balance, engineers need to understand the value of designers' work, and designers must be embedded in the product team alongside engineers. Trusting the instincts of both sides is crucial, as the "invisible hand" of self-interest can guide them towards a better product. Ultimately, a balanced team with talented designers and engineers who are willing to collaborate will lead to successful products.