There was a thread on Twitter on career longevity and fixing issues inside an organization. IT notes that often there is a problem and someone is assigned or hired to fix them. Often when someone starts to dig in, they can fix some things and reduce the pain.  That's good, as things get better.

However, as you gain more knowledge of the issue, sometimes you realize there are more fundamental problems. If you try to fix them, you might make things worse. This could result in a repeat of the process of worsening and bettering of the problems over time. You might not make much progress if new people are constantly assigned when things get worse. If you stick with the person that is working on underlying problems, things get better over the long term. I don't know how often I find management willing to stick with the same person. 

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