I find that Swarm is the only thing that fits my use case of just shipping. There's so much complexity and overhead with kubernetes and often I just want something that works so I can ship it. You just can't beat Swarm for building an insta-cluster that works well and quickly gets you where you want to be. I'm sure kubernetes is great if you have forty datacenters around the globe, but I don't, and neither does anybody I'm building services for.