Counter point. How is owning a namespace on k8s with a shared services team looking after k8s health any different from using amazons aws apis and having share

Counter point. How is owning a namespace on k8s with a shared services team looking after k8s health any different from using amazons aws apis and having shared responsibility with aws? I don't really understand the railing against complexity just because you can see how the sausage is made. What's the deal?