A product manager works at a higher level than those roles. They aren't implementers - they collect information, identify needs, create plans, and get approvals

A product manager works at a higher level than those roles. They aren't implementers - they collect information, identify needs, create plans, and get approvals. And then direct the roles you mentioned to do the work needed. A PM will say things like: "I spent 120 hours talking with our users last quarter. They want a macro language added to the product to make their work easier. Our major competitor already has this feature. We have a budget from the executives and 6 months to get it done. We can get the CX person to do some focus groups to figure out how the users expect it to work, the designer to create some interface options for everyone to choose between and then do the UI wireframes, then the leads can work together to plan the coding schedule based on the implementation phases I will give them."