So for example if you updated the file and need to re-upload it, there is no way for you to delete the previous one.
if this is something you'd fancy then copyparty might be worth a look -- it lets uploaders undo their own uploads within a configurable timeframe, even in folders where they only have write-only access (the ability to upload files without seeing existing files).
disclaimer: I'm the author -- and also thrilled to see someone else suggesting it in the thread!