It is not a browser, or a file manager. It is a file selector. So it allows you to select files, not do some file management. It is not rocket science. I get bitten at least a couple of times a week on Windows when I stupidly drag and drop the file I want to open, and instead of the sensible behaviour it gets just moved to whatever the app thought the default directory should be for its open file dialogs.
> a completely redesigned open and save dialogue that works a little more like Windows and KDE
Hell, no! Let me double that: hell fucking no.