You website is not just a tool, it is a service, and therefore a product. Your prospects make buying decisions based on your website. Your customers make repeat-buying decisions based on your website. You risk losing future customers because of your website.
Concise Requirements
Concise requirements give your team a useful, easy to read and easy to change understanding of what must be done. Great requirements exist to do three things: Identify the problems that need to be solved. Explain why those problems are worth solving. Define when those problems are solved.