I had a discussion regarding this with my boss and started listing the employees, who resigned in the past 1 year. Once they were analysed keeping in mind this article, we got to know that most of them were not ready to be flexible as per company requirement. They were not ready to change the process as per the need of the hour. This made them perform less and were not accurate in their work as they were not mentally ready to change. And I'm talking about extremely young employees, who are at stage of learning. So I'm not sure if its always the Manager who influences job change.