FWIW I agree that reactive infrastructure is fairly limited in scope. The traditional model of infrastructure is everything running in a single server. If your unit of deployment is a vm, then orchestration, service discovery, security policy must be done within the vm image or via a configuration management system. If your unit of deployment is a container, then these pieces can be done outside of the container system. A standard interface for the way the container communicates with the outside world allows these systems to be shared and reused and perhaps one day standardized.