Product managers interact with Internal Developer Platforms (IDPs) like Humanitec primarily through a single source of truth and visibility into the state of infrastructure and configurations, which enables them to have consistent conversations with their teams. Traditional CI/CD setups are often complex and make it hard for product managers to understand what has happened, what needs to be done, and what has gone wrong, particularly in microservice architectures with many services and dependencies. An IDP like Humanitec simplifies this process by providing a declarative way of describing applications in an infrastructure-agnostic manner, creating a log of all changes made to any part of the application at deployment time, and allowing product managers to focus on what's important to the business rather than waiting for infrastructure provisioned by others.