It would make sense if they make this. This way you could use your photo library, music library, video library and documents library easily on you phone/tablet while on PC you can 'consume' it through the apps but still have folder acces and control when you need it.
But since they killed the music library part when they killed the Groove apps, they still haven't a photo solution on mobile and still don't have a movies app on mobile or eBooks support so I am thinking of switching clouds for my personal stuff. My corporate stuff I will keep on OneDrive For Business in O365.
You are better off that you sync/upload your pictures, music, files and eBooks into iCloud Music/Photos/Drive/iBooks or Google PlayMusic/GooglePhotos/GoogleDrive/GooglePlayBooks. All those services have sync clients and tools to dump your files in Windows Explorer. And it works way better on mobile with way more options available there.