I don't think their advice about not using it in a startup is correct either. You just need to somewhat know what you're doing.
I know of such a case, where a single engineer could leverage the helm chart open source community, and set up a scalable infrastructure, with prometheus, grafana, worker nodes that can scale independently of web service, a CI/CD pipeline that can spin up complete stacks with TLS automated through nginx and cert-manager, do full integration tests, etc.
I found that to be quite impressive, for one person, one year, and would probably be completely impossible if it wasn't for k8s.
I know of such a case, where a single engineer could leverage the helm chart open source community, and set up a scalable infrastructure, with prometheus, grafana, worker nodes that can scale independently of web service, a CI/CD pipeline that can spin up complete stacks with TLS automated through nginx and cert-manager, do full integration tests, etc.
I found that to be quite impressive, for one person, one year, and would probably be completely impossible if it wasn't for k8s.