Systemd haters? But seriously, this could well be because of business environments where applications require specific OS versions to keep being supported by the vendor. Or better: where the orchestration tool cannot be updated because of the old OSs while said OSs cannot be updated because it will break orchestration.
This is why people love containers: you can run insecure software on insecure OS (component)s while pretending to be in control on your shiny Kubernetes cluster.