I have had a good manager and here are some concrete examples. He thought it was important to deliver what we promised so he would work with us to get good estimates and would then bring those outside our team and argue for a reasonable time/scope. He would deflect stupid requests (add AI to our project that had no reason for it). In my four years working under him he got us two off cycle inflation adjustments by going to HR and telling them to retain good talent in software we need to pay more.