You are responsible for a “software factory," i.e. the organization that develops and maintains a software system.
You serve as an intermediary between the business side and your software delivery team. There is pressure on you to deliver a lot of functionality - fast and without defects.
You have a limited amount of developers. As such, developer time is a scarce resource that should be used 100% for creating business value (features).
You are responsible for providing the environment so that your developers can work efficiently.