Product Managers are generalists leading product teams of domain experts (developers, designers, etc). This can lead to gray areas of responsibility and conflict. Product Managers are responsible for the success of the product and are expected to weigh-in on all product elements - from design to development to delivery - yet at the same time defer to other team members on important product decisions.
John Kresse talks about some of the gray areas he's experienced in his product management career when working with fellow team members. He provides resources for working effectively with these colleagues to get the most out of your team.