Alt-F4, as you say, works and is the quickest way to close Metro apps. Why would you not be supposed to use it? It's the easiest way of closing any Windows application - always has been.
They didn't. As another poster stated the design is that you grab the top of the app and drag it to the bottom of the screen. Really odd using a mouse but surprisingly easy and natural with touch.
Makes it really quick to close the application on a touchscreen. Everything in W8 metro is designed for touch and can be awkward with a mouse.
Yes they did. As the OP states, Alt-F4 will close a Metro app. It's not the only way of doing it - Windows has always offered a number of ways to close programs, and it still does.
I disagree. They envisaged doing it by touch - win8 metro is almost entirely designed around touch. The alt-f4 is MS doing the usual providing support for everything past - one of the reasons windows is increasingly bloated.
Win8 is nice on a touchscreen but not as natural with keyboard/mouse.
Microsoft provide several ways of closing programs (as they always have done). They do so because they envisage different methods suiting different people. Choice is good.
I appreciate that you prefer to use Windows 8 with a touch interface. Others of us find that it works just fine with a keyboard and mouse. No-one is right, and no-one is wrong.
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