Most managers cannot identify the performance of developers or similar personal. They focus on their management and have mostly no idea what their people are doing. They do not sit together with them and invest time in quality, since all that they are evaluated at is quantity. It's not their fault, it's the culture of the company. I'm a C level manager, and I hate how some companies want to micro manage their team and at the same time have no idea, what they are capable of and what their problems are. I'm sick of it.