Separately from any details of this post, I think you misunderstand what kubernetes is. To me, that's something worth reading and thinking about.

You seem to think it's like a virtual machine, and it lets you run containers anywhere regardless of operating system or host machine. This is not correct. You can't run containers using k8s directly on a Mac, for example, because there is no Linux kernel to run the container. You need a VM first, then you can run k8s inside of that VM. Kubernetes does not let you magically run a container with ARM binaries on an x86 machine either. You would need additional tools to run binaries for another architecture.

You're totally right that in practice, you usually don't need to think about the host OS when you're using k8s. It is nice to not worry about what packages it has installed, etc. But it is not a tool that allows you to run an arbitrary container anywhere.