What's all the fuss about "edit source"?

Update: 15 January 2015
This is now possible for all file formats except for ITD, updated in Studio 2014.
SDL Trados Studio 2011 SP2 has introduced “edit source”… but only for Microsoft Word and Microsoft PowerPoint file formats at the moment.  For Freelance Translators this is a welcome addition because it has been one of the most heavily voted for ideas on the SDL Ideas site.  However, is this enough and why haven’t SDL introduced this before?  This is fast becoming a topic for much debate on the public forums and Facebook pages so I thought it warranted a little insight into the problems of introducing “edit source”.
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