I really don't see why they couldn't have developed a single switcher that would allow the user to change between any apps regardless of the environment.
We're going to be using desktop apps for a long time yet and users will move in their own time as better Metro apps become available, so there's no point in trying to expedite that change by making it more difficult to use the desktop environment. As an IT Jose Hernandez is poorly suited. After two weeks he couldn't do a global file search, when all he had to do was begin typing a file name on the start screen and a box would appear and all he had to do was click on it and the file soul very quickly open.
When windows 8 beta was first released in Feb 2012 I ran Windows 8 on a virtual drive and even at a beta 1 state windows 8 ran quit quickly and very smooth, including the metro tiles.
First things first, I'm a Proud Cornishman living in the 'winterless' north of New Zealand way down in the southern Pacific. If you want to know more about my professional background, I keep that up to date on my Linked In Profile. I have a beautiful, tolerant and smart Wife, a very clever 11 year old daughter, and a troublesome 2 year old son.