No no, you see, most people like organisation. Also, it's intuitive as it is analagous to actual folders that store actual files. It would be kind of weird if you could store a file in multiple folders. What would that even mean? If you delete a file from one folder, is it deleted in the other? Folders aren't meant to be labels (labels are labels), they're locations. Your toothbrush is in the bathroom, pots and pans in the kitchen, etc.