As has been extensively discussed on prior occasions (see kubernetes/kubectl#151), kubectl get all is not recommended, has been removed from documentation, and should be removed.

It appears that the primary reason this has not yet been completed is because the issue was filed against the kubernetes/kubectl issue tracker instead of kubernetes/kubernetes. At the request of the kubectl maintainers in kubernetes/kubectl#1584 (comment), the issue is being copied over to here.

The requested change is that kubectl get all is formally deprecated and eventually removed - or, fixed so that it does what it says it does.