I once had a Block like that with 256 Slots that did not have a GUI back in GT5. It was very unhelpful due to the lack of GUI, despite its obvious utility in piling up Dusts and Ingots.
Unless ofcourse the Input Slot contains a partial Stack of Pumpkin that has not been processed yet. This sort of thing is why LIFO does not work well without manually taking out the previous Input.