It's an error to simply transfer "it works for music" to "it works for everything". That it works for music is largely because sharing media files is verboten in our Brave New World - sharing is not a problem that needs to be solved there. But sharing non-media files between users is not an exceptional case, not even remotely - it's common as muck in business.

The idea that the 'normal' user is only a home-based casual web-browser/photo-taker/music listener is misleading from the outset.