[sandGorgon]

This is actually not correct and I'm a little surprised at the comment.

The ingress story in kubernetes is bring-your-own and usually people run their clusters behind Google or AWS LB which are supported as ingress in k8s. Running k8s on metal is a super daunting task. Choosing your network plugin is another task and usually you have to install a different system service on each of your nodes - Swarm has this built in.

And lastly the Compose file format. 10 lines of Swarm compose file literally translate into multiple dozens of separate k8s yml file. Creating this in k8s is super complex in itself.

Swarm is really pretty nice for someone setting up a few dozen nodes and services.