The document discusses the importance of understanding users when developing products. It notes that all roles involved in product development, such as testing, design, writing, marketing and sales, require understanding the user's perspective. The common factor among these roles is focusing on the "U", or users. Understanding users gives developers an edge, allows gaining users' attention and trust, and helps products provide real value by changing users' lives for the better. Developers should have relationships with intended users before product creation to truly understand their needs and workflows.