Yep, the problem isn't deciding to keep low performers; it's that it's extremely difficult to identify them or separate them out from the performance of the sys

Yep, the problem isn't deciding to keep low performers; it's that it's extremely difficult to identify them or separate them out from the performance of the system surrounding them. This is basic Deming management wisdom: most of the overall performance of your company comes from the system and environment surrounding individuals, including the individuals themselves. Optimize the whole, not the parts; focusing on individual performance is just a distraction that drives overall performance down the drain.