Personally, a lot of my experience is that my manager knows and understands the issue and is doing their best, but at some point there's only so much "managing

Personally, a lot of my experience is that my manager knows and understands the issue and is doing their best, but at some point there's only so much "managing up" they can do to prevent larger dysfunction in the org from effecting the team. I had a discussion with my manager about this the other week and they asked me to let them know if I was considering other work so that they could try to fix it - my response was that I didn't think that would help. By the time I'm considering another job it's _because_ I no longer think my manager can or will do anything to fix the issues I have. People generally don't leave companies when they feel like their manager would have been able to solve their issues with the company.