In my case I create graphics applications, all of these contemplate the use of multiple local files.
In the case of janvas (SVG editor), I am currently forced to include the images that the user chooses from his HD within the SVG document. So doing the documents can become quite large, as in the case of creating a photo book with all the images, difficult to save remotely at each change. It would be interesting to link the images rather than to include them. Before I used a chrome app and api filesystem that allowed files selection in “retained” mode, then these Chrome APPs were deleted outside Chrome OS.
Furthermore, the use of local files frees us, small developers and small businesses, from keeping the files of our users remotely, thus freeing us from the onerous management and responsibility of user files. This was partly solved with Google Drive, but that’s not enough.
I believe that the possibility to save and read files will opening a new chapter for the web.
We need these APIs!