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Because it takes a full re-write and re-architecture
If you've been a Windows developers, your apps are probably built to do things a certain way, and the Metro/WinRT system won't allow it. Any time you write a file or read a file, you need to completely reengineer those sections. In many cases, you won't even be able to rewrite the application. For example, you won't see a Metro/WinRT registry editor or defrag tool.

At best, developers will need to relearn concepts that they've been using without change since they learned to program.

J.Ja
Contributr
Posted by Justin James
6th Dec 2011