By itself, the question seems an easy one to answer. But, if you revisit it through the eyes of a 9-year old who still isn’t aware of the importance of the market economics in the development of a product, it is remarkable how logical the question is!
Throughout history, cost (+ demand) and performance requirements have played their own roles in the development of a product or an idea. While the development of a novel idea is mostly driven by the performance requirements/ or potential applications, a commercial product development is dictated by the cost and demand metrics. And although this journey from an idea to a product is a long one, it is imperative for the progress of our society.