Maybe some employees will be less likely to stick around, too.
It is unlikely that every employee gets their input valued. The game of favoritism is older than Amazon, even older than the written word. Usually, a small clique gets to the top and gets their input valued quite a lot - at the expense of everybody else. Some people are more talented in office politics than others.
For the "everybody else", it means either curry favour with the clique or get out.