I have completely tanked a kubernetes cluster before. Everything kept working. The only problem was that we couldn’t spin up new containers and if any of the running ones stopped, dns/networking wouldn’t get updated. So for a few hours while we figured out how to fix what I broke, not many issues happened.

So sure, I can kinda see your point, but it feels rather moot. In the cluster, there isnt much that is a single point of failure that also wouldn’t be a point of failure in multiple clusters.