Why split the nix into so many VMs instead of just systemd units?
It's DEFINITIVELY overkill, and fills up fast, but nix making everything near fully declarative to roll fwd/back or shuffle between proxmox hosts at any time makes for a clean and easy mental model. Both for me and the AI, because it can infinitely retry a nix flake config until it gets it perfect.
I could definitely slim things down without disko, virtio, etc, and especially whole separate kernels.. but it's also not such a huge diff that I mind. I'm not adding new services all that fast anymore now that I've got my basics + wishlist set up, so I'll grab another box from the local pc recycler if I ever need space for another ~30 VMs some day rather than when I need space for another ~40-50 LXCs.
And in the meantime if OpenAI publishes a scary brag about how GPT-7 popped a shared kernel on accident I can be relieved that my private bookmarks repo isn't vulnerable while the internet burns down.