I had a friend who worked as a QA engineer (hospital processes) for a presitigious children's hospital. The QA department came up with any number of potential, well-conceived plans, but the falling-down point was always the doctors. One of the primary pain points was the lack of interoperability between different departments' record-keeping. Each department head had their favourite vendor, who would give them all sorts of goodies on the side, and as such, none of them wanted to change.

So, you'd have a heads of department meeting where the new QA plan would be discussed, which necessitated regularising the software across departments. The standard refutation was "If I can't use software X, children will die". Everyone knew this was utter bullshit, but there's nothing you can do when the head of department is considered the final domain expert. "Children will die", uttered by doctors and surgeons, killed more efficient processes in that hospital.

Another story of his was at another meeting where one specialist ventured an opinion. It was derided by one of the old-school, a veteran of nearly 30 years: "We don't do things that way; you'd know that if you'd been here any length of time". Said the opinion-venturer: "I've been here 17 years". That is one insular society...