[Doubleslash]

It's not trivial but it's also not an order of magnitude more difficult anymore, as you describe it. There is a reason why Kubernetes gets a lot of backing from corporate customers - precisely because it hides and abstracts most of the underlying infrastructure and provides platform-agnostic primitives that make sense at the application level.

Once you have deployed your stack on Kubernetes, you can pretty much run it on any cloud or infrastructure with minor tweaks at most.