Isn't that the same approach that Docker originally took with the Docker Hub Registry, where you can pull down pre-packaged monolithic images (albeit small ones if needed) via "docker pull ..."?[1]

I think this was important quote from the article: "LXD is more like an “OS container” while Docker and rkt are more like “application containers.”"

[1] https://docs.docker.com/userguide/dockerimages/