[boulos]

Disclosure: I worked on nested virtualization for GCE.

Even when you offer bare metal, it’s actually still nice to have nested virt! Otherwise, every node has to be a full sized host. So when you have a K8s cluster or similar with a pile of nodes and want to allow some teams to use it (e.g., Android emulator, firecracker, whatever), it’s really nice not to have to say “okay, this group requires full bare metal hosts that they manage themselves”.

tl;dr: nested virt is still a nice to have so that all your infrastructure looks the same.

Edit: Also, you can trigger migration yourself if you want (gcloud compute instances simulate-maintenance-event), but that's mostly to convince yourself that nothing bad will happen.