The Product Backlog is a list of potential work to be done for future Sprints. This list is most vibrant when as many people as possible contribute to it. Those directly connected (stakeholders such as the Team Members, users of the systems, etc) have a stake in the product’s growth so they also have plenty of ideas that may benefit its value. Adding a Product Backlog Item (PBI) is like brainstorming where all ideas are welcome. Then it is the responsibility of the Product Owner through conversations with others to order the list based on the most value for the least effort (and sometimes to reject PBIs if they are too outside the product vision). If the creation of PBIs is limited to just a few individuals, or even just the Product Owner alone, it is likely that many great ideas will not surface and will be lost. Also by having all stakeholders contribute PBIs, the Product Owner builds collective ownership in the work of the Scrum Team which helps the team overcome obstacles and become supported by a larger group.