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I've read all the comments and they mostly make sense.
My big question is this, is Winrt dev model powerful enough to provide all sort of tools that are responsible for making the windows experience special? Or would people be forced to use badly thought out programs from Microsoft.

Take defrag for instance, Microsoft's own version is complete crap, "Smart Defrag" is wonderful. There are tons of other examples but I'm sure you'll get my point.

Is winrt a toy?