This is a really niche use case, but let's try anyways since you can do it with Garage Band [1].
Music exists in its own data space on iOS organized by artist, genre, album, and so on...you know...what the user wants for playing music. Now, this definitely wouldn't work very well for meta-data free content...but how many users deal with data that lacks meta-data? File system path is just one awkward form of meta-data that they could manually specify.
Separate viewing and editing applications isn't that rare; perhaps every single example of it is niche, but in aggregate I'm not convinced it is.
What you have described is just a non-hierarchic file-system which has been tried in the past; it is possible that the time has finally come for it though. Some issues are that a general-purpose one is much harder than a special purpose one (e.g. music only) and getting vendor buy-in has been hard. Apple is in a position to force vendor buy in so it will be interesting to see how things play out.
Music exists in its own data space on iOS organized by artist, genre, album, and so on...you know...what the user wants for playing music. Now, this definitely wouldn't work very well for meta-data free content...but how many users deal with data that lacks meta-data? File system path is just one awkward form of meta-data that they could manually specify.
[1] http://www.midnightmusic.com.au/2012/08/how-to-get-garageban...