This idea is rediscovered every few years in a new project. I tried this with StorageBox many years ago and even did some UX research in this context. Turns out

This idea is rediscovered every few years in a new project. I tried this with StorageBox many years ago and even did some UX research in this context. Turns out many users don't like querying only as it they feel they can not search their data exhaustively, and might "lose" some of their data this way. Also for not tech savvy users, folders have the nice interaction pattern of question-response via menu selection. They see something, click, see something, click, without realizing that they are navigating a folder hierarchy.