"The primary entry point for this API is a file picker (i.e. a chooser)." ...so what would be difference to today, where a user can "upload" files to the brows

"The primary entry point for this API is a file picker (i.e. a chooser)." ...so what would be difference to today, where a user can "upload" files to the browser's local storage, and then the web app can work with the file(s)? I get it that you avoid to have to "re-download" the file, but that seems to be a small benefit for the risks we get.