What does HackerNews think of dashboard?
General-purpose web UI for Kubernetes clusters
Version 4 is a complete rewrite of the app in Flutter and Go and supports all major function you need to manage your Kubernetes workloads, like viewing, editing and deleting resource, getting the logs of your workloads, getting a terminal for your containers and port-forward your services.
Some providers / distros may have deprecated it, but the community hasn't.
GKE is basically a wizard that just runs a pre-built image for the master and node VMs, and comes with some support for upgrades. There are very few settings [1] aside from the machine type. So it's pretty rudimentary. You'd think that GKE would come with a flashy dashboard for pods, deployments, user management, autoscaling and so on, but you're actually stuck with kubectl + running the Dashboard app [2] as a pod, which, while nice enough, is not integrated into the Google Cloud Platform web UI at all. Kubernetes runs fine, but GKE itself feels unfinished.
Anyway, a lot of people were asking for privileged mode back in 2015 [3], and it kind of looks like they turned it on by default rather than developing a setting for it.
[1] http://i.imgur.com/6pGRzl9.png