I think this all ignores the opaqueness of most PaaS providers - when everything is on a single box, you have infinite observability, standard Linux perf analys

I think this all ignores the opaqueness of most PaaS providers - when everything is on a single box, you have infinite observability, standard Linux perf analysis tools, etc. If you do it correctly, it is loads easier to reason about and understand than a complex k8s deployment.