While R&D and Quality both want as many products to be shipped out as possible, Quality has the added responsibility of making sure that all the products meet all of the regulations. While their overall goal is the same, it is the added responsibility that causes R&D and QA to constantly butt heads. R&D wants to ship out as many products as they can but the extra responsibility in Quality prevents that from happening. It is a quite literal case of quality vs. quantity and there is no way to optimize one without sacrificing the other.