How is running a container in an LXC worse than in a VM? It’s not really, is it? No, not really. Kubernetes could also be built on top of the LXC as well, sure. There are a number of genuine benifits from running docker on top of an LXC, and it doesn’t compromise security or come with a significant performance drop (unlike VMs).
Sounds like OP is gonna flash OpenWRT… Did you read the post?