You would still hope that an OS upgrade wouldn't leave your data in an unusable state! As someone above pointed out, it would've been pretty easy for the OS install to determine if you had feeds and export them into an open format and let the user know where they had been exported too so that they may then do something with it.

I don't think the lack of the feature is the main complaint in the article it's that her data seemed to be suddenly gone (I know she eventually found it but it took a third part tool to try to export the proprietary format into something usable).