As your circle expand, it is impossible not to notice the walls and blockers that are endemic. If one doesn't see this, it's often because that person is in their own little bubble, and not doing much to improve the organization either.
Often, it takes both employees and managers to really make the shifts, over many many years. By the time it happens, the individual contributions are mostly forgotten or employee left long ago.
If you as my manager are not able to do anything either, we're part of a sick organization, and the only thing to do is leave.