Answering a now-deleted answer regarding PS4 controllers working out of the box on Windows:

PS4 controller support on Windows used to be a huge hassle, because you had to install DS4Windows to make it work. Nowadays, Windows automatically downloads the proprietary drivers to make it work, but I'm not sure if that covers the PS4 controller-specific features such as the touchpad, gyroscope, lightbar or if it enables XInput support. I think the PS4 controller situation supports what OP above is claiming.

Can Valve do the same with their controller? Release a Windows driver so that I can use it with my emulators?