For example, the ability to spin up ad-hoc services to test the software against, like if I was replacing mysql with postgres, or experimenting with a caching s

For example, the ability to spin up ad-hoc services to test the software against, like if I was replacing mysql with postgres, or experimenting with a caching service. If I have access to a terminal connected to a container, that's nice, and maybe I can experiment with some of these services, but if this container is in a Pod in Kubernetes and the K8s scheduler decides to move my Pod to another node, I just lost all of my custom work.