A manager's manager will never fully agree, especially if one is a good and valuable worker: by enabling one to progress in one's career, it opens up the possibility to lose that worker. How will the manager be able to get things done and report success to their boss, if all the good people are gone?
The entire system is ill, seriously ill. The entire hierarchichal model is failing, as is evident by the state of the world and the state in most large, publically traded corporations.