True and decent read. Holos is a generic runner underneath, and I'm not trying to compete on the curated-OS-image front; the assumption is you bring a cloud image and cloud-init does the rest. Unattended installs for Linux work today through cloud-init (that's most of what the YAML drives). Windows/macOS would need a different path.. autounattend.xml injection for Windows, custom payload for macOS; I haven't built that. If there's interest, a provisioner: type block that picks the right unattend mechanism based on OS isn't crazy, but it's not on the near-term list.