If you open the start bar you obviously want to start a program. Why only use 1/10th of the screen to show programs when you can give a full screen view (Metro)?
Or the obligatory car analogy...you'll never get the hang of driving without getting behind the wheel and trying it...practice will increase your experience points and skill levels.(Okay, a car analogy, and a game analogy...so shoot me! Just don't use GTA tactics!)
GTA tactics work fine too. Only difference is in real life some of the hookers are cops.
Professional wrestling: ballet for the common man.