I know that in order to use the following you must install Apple's Support Drivers on your Windows Image. * USB 3 * USB-C on the MacBook (Retina, 12-inch, Ear

I know that in order to use the following you must install Apple's Support Drivers on your Windows Image. * USB 3 * USB-C on the MacBook (Retina, 12-inch, Early 2015) and later * Thunderbolt * Built-in SD or SDXC card slot * Built-in or USB Apple SuperDrive * Your Apple keyboard, trackpad, and mouse Assuming BootCamp were just a hyper-visor exposing the underlying hardware or a HAL, why are custom drivers necessary for those things?