I'm not trying to nitpick here, but that justification is awful. It goes against reliability engineering on a deeply fundamental level, pretty much guarantees to make already not that reliable things even less reliable. Generally the more isolated entities you have and the smaller they are the less they affect each other and the environment when something bad happens, the faster they can be recovered, the fewer end users they affect, etc. If I remember correctly, this is even how some Kubernetes people justified ideas behind Kubernetes itself that you want to drop now.