Visual Studio's site redesign began in March 2016 with the goal of creating a more user friendly, reponsive website. The site has to serve three purposes; first, as a product marketing site; second, it is an informational site complete with tutorials, how-to's and docs; finally, it is a community for developers to get and share apps.
The site needed to be more accessible and responsive in order to serve a wide spectrum of users. The design required changing everything in an effort to align visualstudio.com with the Microsoft's long term goal of snap all of their products to a single, unifed brand standard.