Windows 7 added a number of APIs on top of Vista so implementing backward compatibility means a lot of additional complexity with minimal benefit. A prime exam

Windows 7 added a number of APIs on top of Vista so implementing backward compatibility means a lot of additional complexity with minimal benefit. A prime example is the windows build of Electron (https://github.com/atom/electron https://github.com/atom/electron) that uses some touch control and notification APIs that are only available in Windows 7 and later. People have been asking for a long time for Windows XP compatibility and the answer has always been a firm NO.