And a key feature of Windows 95 was the explorer with your home directory where you could doubleclick on files and the appropriate application would open, so users won't have to think about the application, but the file first.
However abstracting away from a pure file based view also has benefits, like history or having different views on the document (i.e. to share a read only version)
The main question is: How well will those things serve as lock-in in future, GDPR does a first step there by enforcing that there is a way to extract the data (not that the export format neccisarily is is really usable ...)
