One important thing for me is that Docker also handles other operating systems than Linux through their respective hypervisors. Docker might well die but first

One important thing for me is that Docker also handles other operating systems than Linux through their respective hypervisors. Docker might well die but first I will have to be able to locally build and test containers on Windows and macOS, before deploying them to the Kubernetes cluster–without fooling around with Virtualbox, Vagrant and the like.