So have I, having failed to manage installing Win 11 without a MS account in the end. Actually I only wanted to complete a dual-boot Win 10/11 setup without having to haphazardly install Win 11 on top later, not actually use Win 11.
Unattend has been part of windows setup for way longer than a decade.
The current form of it was introduced in Vista.
The same concept existed before, but I know less about how it worked back then.
Even without unattend, something I think people don't realize is that you can install windows on the command line. Diskpart to partition, dism /apply-image to extract files, then bcdboot to install the bootloader.
