Designing websites to optimize for both traffic and conversion is important for success. Websites should be designed to clearly communicate their topic to search engines to attract the right kinds of visitors, rather than taking a generic approach. Design is about solving problems, not just aesthetics. Success requires getting the right number and type of people to visit along with converting as many visitors as possible into actions like purchases. Investing effort into both traffic and conversion delivers the best results, as having one without the other leads to no success.