That's what we do and it's great. It doesn't even apply to just Kubernetes, you should be able to swap out most components of your infrastructure without manual

That's what we do and it's great. It doesn't even apply to just Kubernetes, you should be able to swap out most components of your infrastructure without manual work, that's why we even invented all this modern software, or even hardware for that matter: redundant power supplies! If we can do that, why is everyone so scared of doing the same for other systems?