In product development, data is often used as a crutch to play things safe. When you want to justify the decisions you've made on product, paying lip-service to using data provides you with the easy answers.

Good product managers do the exact opposite. They use data to constantly challenge their assumptions, to validate hypotheses, and to solve urgent problems. At the end of the day, using data to build product is incredibly simple. It shows you how well you're doing, and where the opportunity is to do even better.