Manufacturers are always trying to understand their current performance in order to improve. Often, nearly everything is measured, just because it is possible. However, manufacturing activities and processes are that complex, that evaluating isolated metrics can be misleading and result in local optimizations and counterproductive decisions.
It is not about minimizing one metric and maximizing another. It is a complex balancing act, influenced by many different factors in manufacturing operations. A well-designed metrics framework, reflecting those influences, is required to understand the actual performance and use that as a basis for further improvement.