It is more then just adding a keyboard. All the interactions in surface are first class keyboard friendly. Switching, closing app, switching tab etc. work well

It is more then just adding a keyboard. All the interactions in surface are first class keyboard friendly. Switching, closing app, switching tab etc. work well with keyboard. So you have a device which supports multiple usage perspectives either working on a 5 page word doc/blog with keyboard, touchpad or browsing web, watching movie, playing angry birds on a light weight touch enabled tablet