Controller remapping is an important feature because it allows gamers to customize the buttons on a controller to suit their needs.
Sometimes a game may not have the best layout or it might come down to personal preference. No matter what the reasons, being able to change the configuration of a controller is important in modern gaming. The Xbox One has had the ability to customize buttons on a normal controller for a while now but Windows 10 users weren't given the option. While there are always other third-party programs you can download which allow you to accomplish the same task, native support is still preferred over potentially dangerous changes.
Full story from the WindowsCentral blog...