The point of ReactOS is driver-level compatibility with Windows. The project implements their own equivalent of things like the Windows HAL or Windows Driver Mo

The point of ReactOS is driver-level compatibility with Windows. The project implements their own equivalent of things like the Windows HAL or Windows Driver Model, which ideally should mean ReactOS can be a drop-in replacement for old Windows machines used to run some piece of hardware that only has a Windows driver. There are still industrial machines being driven over parallel port by WinXP. The Win32 API program used for controlling the machine most likely works just fine with Wine, but the necessary driver definitely doesn't. The ultimate goal of ReactOS is that you could just install the driver on it and thus control the industrial machine exactly like WinXP did it. It's an admirable project, though of course it's nowhere near ready for use. Currently ReactOS doesn't run on a lot of real hardware, and is still well behind WinXP in terms of hardware support (USB memory sticks don't work, USB keyboards have problems, Wifi has minimal support and only for open networks, etc), but the goals of ReactOS are very different from Wine.