Near as I can figure, the goal is to build your own Linux distro to run as a guest in a virtual machine (hypervisor virtual machine, not bytecode virtual machine).
If you want to make your own distro, this is certainly friendlier than the old way, which was "do it all on a standalone machine and hope you don't break anything or wedge it into a difficult-to-debug state".
If you want to make your own distro, this is certainly friendlier than the old way, which was "do it all on a standalone machine and hope you don't break anything or wedge it into a difficult-to-debug state".