Sure, you can use dpkg to orchestrate connections between services on the same machine, but last I checked dpkg isn't aware of other machines running other services and orchestrating the connections between those. Service orchestration between machines is something Juju excels at. It's really server and service orchestration abstracted so that you don't have to worry about what machine is where and connected to who. Juju maintains those relations for you, so it's really more like apt for the cloud.
