I agree with this. As an engineer that is outside the quality department, looking for continuous ways to improve processes is key for a company to continually increase efficiency and productivity. A lot of Green Belt Six Sigma/Lean projects are directed toward demonstrating some sort of increase in efficiency or savings. Quality tends to resist these changes, questions it, and in some cases refuses to go through with it for the reasons you stated of increased resources and time. Moreover, I tend to think Quality at times tends to not understand and questions the credibility of data or a specific analysis. For that reason, Quality wants to stick or revert back to old practices.