A persistent volume provider would be great: https://kubernetes.io/docs/concepts/storage/persistent-volum...

This makes it easy to declare the volume as part of the deployment and automatically attach storage when the container is run. Mounting on the host isn't very easy (or even possible sometimes), especially with spot/preemptible instances and the increasing abstractions by managed K8S providers. The pricing model might need to be different though if billing on a container-mount level.