I don’t think that any essential projects should be cancelled or even put on hold due to them being “less of a priority.” This slows down the overall design process. Unless however, the project is unessential, then there is no reason to waste manpower or resources on it. But to answer the question, yes I think that more essential projects, such as the knee as you mentioned, should hire more employees to make progress faster. The most essential projects being completed or progressed on slowly is what can drastically slow down the entire design process. For that reason I think it is not only ideal, but essential to focus a majority of resources on the most essential projects, but at the same time, not to hault any other areas of design or development.