I have listened to many arguments that product owners do not have time to do both roles. In the current context, that’s true. The product owners I speak with spend 40 hours a week writing tons of user stories. At that point, you need to ask, are those user stories even valuable? What are they prioritizing them against? How do they know that they will solve a problem? If you have one person spending that much time writing user stories, every week, you are most certainly in the build trap.
