It's precisely it not being a SystemReady ARM64 device that makes it Microsoft's responsibility. The Windows kernel requires core changes to support this hardwa

It's precisely it not being a SystemReady ARM64 device that makes it Microsoft's responsibility. The Windows kernel requires core changes to support this hardware; it cannot be done with just drivers. Nobody can make Windows work on this without Microsoft's help. Same reason we had to make a few changes to core Linux plumbing, besides adding drivers.