Wireplumber manages your interfaces and their connections automatically
Qpwgraph let’s you view and modify these interfaces and connections manually
Bot wireplumber and qpwgraph talk to pipewire to change the state of your interfaces, but they are unaware of each other. Theoretically this means you can forgo either qpwgraph or wireplumber, but you don’t really want to go without wireplumber as that would mean you have to configure every interface and connection manually.