> The creatively named “Windows.Gaming.Input” (WGI) is the newest input API for Windows.

For now! The Windows.Gaming.Input API is the Xbox One API, and has been around since Windows 8 for UWP and the Xbox One SDK. The new one is GameInput [0], which is used on the Xbox One X by Microsoft's new gaming SDK, the GDK. It's not yet on Windows, but it is, ostensibly, coming soon...

[0] https://docs.microsoft.com/en-us/gaming/gdk/_content/gc/inpu...