Well, the point is you don't have to understand it all at the same time. Kubernetes really just codifies concepts that people were doing before. And it sits on the same foundations (Linux, IP, DNS etc). People writing apps didn't understand the whole thing before, just as they don't now. But at some level these boxes are plugged into each other. A bad system would be one where people writing business software have to care about what box is plugged into what. That's absolutely not the case with Kubernetes.