I'm doing a lot of tech interviews for my company. Whenever there's someone with a homelab I can be 80% sure they have a lot of knowledge in their respective homelab ecosystem (vms/Kubernetes/containers/etc.) and absolutely no problem adapting to new ones. Plus usually some good networking knowledge.
I have a K8s Cluster at home too - it's not only a great Icebreaker but also a great way to see which technologies the other person has worked with.