> Lume automates the macOS Setup Assistant via VNC and OCR, creating ready-to-use VMs without manual clicking. Tart relies on Packer plugins for automation.

This feels disingenuous. Tart has unattended setup support as well, and it's based on the same VNC + OCR technique as Lume. In fact Tart had it first, and your approach seems to be heavily inspired by it. In addition the boot command instructions you're using came from https://github.com/cirruslabs/macos-image-templates/

The only material difference is whether it's built-in or integrated via Packer.