Doesn't Windows setup still use some weird minimal version of Windows? I remember having to hack my employers provisioning once to install virtio drivers and I ended up in this "purgatory OS" where I could use DOS commands to add drivers.
Adding drivers is also painful, since it doesn't really support all of the regular windows drivers. To sideload drivers you have to do it twice, once for the install image and once for the winpe image.
*My knowledge of this stuff is about 7 years outdated, so it's possible they've improved it since then... Unlikely but possible.
https://en.wikipedia.org/wiki/Windows_Preinstallation_Enviro...
https://learn.microsoft.com/en-us/windows-hardware/manufactu...