The UI of Metro IE is optimized for touch. Metro apps don't run like desktop apps. They are sandboxed and have additional security restrictions, don't run in the background (they're suspended), sharing data between apps must be approved by the user.

>Not to allow plugins in IE is ok; but it does not require making the interface almost completely unusable. Plus the IE in the Desktop allows plugins (I think) and in the Metro does not. So security can be breached still. It is like locking the front doors of your car but leaving the back doors open. I am glad you have no connection to Windows team; which IMHO should be all fired.
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