Scrutiny is a type of conversation with customers that challenges your vision and understanding of your product's functionality and use cases, helping you focus on both growth and product/market fit. It involves talking to people who are not in your "sweet spot" and pushing your boundaries, revealing opportunities for growth and shedding light on areas of your product with questions that typical customers may not be asking. Scrutiny can also help you identify your limits confidently, understand why you're saying no to certain features or functionality, and uncover new features that align well with your vision. By seeking out scrutiny, you can balance working on product market fit with discovering ways to grow into new markets, such as those in industries moving to the web.