The article makes a similar point in the section titled “A Dictionary Date” — There’s a lot of new concepts and resource types to learn with Kubernetes that force you of your application in a different way. It’s pretty powerful and logical once you learn it, but it does take a different mind set.
Fortunately, the API is programatic, so it’s possible to build abstractions on top to make dealing with those concepts easier. But that can also take a lot of work to build from scratch…