The developer is rediscovering the concept of a GUI library. The modern variant is the mouse-driven GUI developed by Xerox in the 1970s (and later commercialized by them as Xerox Star) which Jobs famously copied to create Apple’s Lisa, and Gates famously mimicked to create MS Windows. Since they determine the look and feel of a platform and their design determines the ease with which developers can create apps for the platform, GUI frameworks became pivotal to platform wars across all sorts of products, from OSs to browsers, graphics engines and anything else whose success was determined largely by the interface developer experience.