M$ quite happily said that with UAC it was designed to Annoy Users.
What makes you think that their User Interface of Choice is any different? M$ was told by so many people that they wanted a UAC Type step in the process but instead of making something that worked and enhanced Security they made it so it was more of a Hindrance than a Help and then allowed End Users to turn it off. In other words they supplied what they had been asked to but made it in such a fashion that it didn't work as it was asked for.
Microsoft remind me of Ferrari F1 where when they make a decision on anything through the Committee System it's got to be used even when it proves itself to be counterproductive to performance. Instead of trying something that may or may not work they insist on attempting to make it work come what may and never accept that they have made a mistake.
Don't get me wrong I don't see an issue with whatever Metro is now called on a Mobile Small Screen Device but I simply do not see any advantage on a single/multi-screen desktop with a large easily read display area.
Not to mention what Occupational Health & Safety would say about constantly having to press a screen at the desk.
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