It does change, things do get better, but it takes time to see the change. Years usually.

In large orgs "conservative" managers who escalate and block issues usually don't get fired, they just get pushed to some other part of the org. And when/if the issue blows up, they get pulled back in to clean up the mess. Cause few others will have credibility. Same dynamic applies in reverse. The bunch that were in charge, during a blow up will be sent into the background. But will be pulled back when more "aggressive" management tactics are required.