Can anyone explain to me why I would choose a FaaS solution that requires me to maintain a Kubernetes cluster? OpenFaaS and OpenWhisk both require this. To me, this defeats half the reason to use FaaS. The whole reason I use Azure Functions and AWS Lamba is because I don't want to have to manage any of the infrastructure.

What reasons can you think of, why a portable, complete faas/paas solution may be desirable for a company? Perhaps one that isn't quite the same persona as your employer?