The fact is: We have a real problem here. I will use as an example my personal experience.
I am a student, so, I hugely use my Windows Phone to help me in all sort of student stuff. I use a lot the office + pdf app to view and edit my important documents, there are things that we really should have, and I will list some of then:
1. An unified place to put all kinds of files. Why? Though the way we have is great to use, having the recent files, we should be able to view then in a unified way!
2. Sort my office + pdf + some specific image files in a way I can easily use. Why? Having the section control is a perfect way to organize the stuff in a beautiful way. I can have a place to put the Geography audio record and the photos for my work, and a philosophy to put some pdf text and so on...
3. Take my emails + downloaded files and be able to treat then as a NORMAL FILE. Why? Email attachments are files too!
4. Be able to set an app as the default to open a kind of file. Why? It's really annoying to be asked what app should open a kind of file. Plus, this way we will have a bigger variety of apps that support some files, including things like zipping and unzipping that really works.
5. A more comprehensive way to share my files using Bluetooth/emails etc... Why? I can't even send a document to a friend using bluetooth! And we shouldn't worry about the app having to support sharing files.
The Windows Phone doesn't give us an SOLID way to do some tasks. A simple task like sending a file through Bluetooth is confusing and sometimes not possible. What is being asked here is not an access to the file, in fact it is pretty pleasing that we can stick our WP in the PC and manage some files on it. It is only being asked that this same file management we get on PC could be done inside our phone, having then some adds like a download and email attachment folders. It is not being asked a way to access the system files. Remember: There are people that use their smartphone to some kind of serious stuff and they really need this feature. Having the ability to control your files wont at all compromise the security of the system if done right! And, what's the point of saying windows phone is the office phone if we even can't even control our files?
I like my Windows Phone, and I think it is the best mobile system with all it can do. But it needs some features that the people that know Windows will recognize, and features that people in general will need. If we really want that windows phone can be a really strong platform that appeals to everyone, it have to give users and developers some functions that appeals to everyone. You see... I'm tired to see apps saying in their descriptions "We don't have this functionality cause of the platform", and things like file accessibility is one of the mains lack.
And, even in the perfect world where everyone have access to full speed internet at any time, skydrive lacks of things that only local storage can provide. And face it: We don't live in the perfect wolrd where we can access internet at any time.