The main problem is that no one is going to setup their own Kubernetes cluster, it has become a commodity cloud service. You might run minikube on your laptop,

The main problem is that no one is going to setup their own Kubernetes cluster, it has become a commodity cloud service. You might run minikube on your laptop, but unless you are a large company with a dedicated Kubernetes team you are not going to run it yourself. Docker swarm is easier and better if you just need a small local cluster. Though for most things just a single system setup with docker-compose will suffice.