Kind (Kubernetes-in-Docker) is already around and it is somewhat of a niche use case. Minikube also exists to satisfy most of the use cases for single-node clusters on a development machine.

Docker does not automatically make software safe. If you do not know what is in the image you should assume that it is malicious as Docker images can gain root access to the host machine. I don’t see how a Docker image would be less “iffy” in terms of security or ease-of-use.

This is just a think wrapper for K3s, which already has a one-step installation and immediately provides a kubeconfig. Relying on this seems like unnecessary tech debt. It is simpler to just go straight to Rancher for K3s.