The Product Owner’s main responsibility is to maintain the Product Backlog through direct communication with the users and stakeholders. To do this well it will take most of his time and effort to be effective. Hands-on technical is done by the Team Members not the Product Owner since this is not the Product Owner’s strength or area of expertise. If the Product Owner refrains from doing the hands-on technical work, then he is able to provide the vision and share the “what” that the team needs to accomplish. If not, he will be bogged down by the tasks and lose the time and ability to provide product guidance and connect with the stakeholders.
To learn more about Product Owners, visit the Scrum Team Assessment.