Comment by sandeepkd

A hazardous system does not necessarily has to be complex. The article is a generalized list which makes it bit harder to reason with on this topic. A big part of the complexity gets added over the time as a part of failures, effort to introduce more fail safes, processes to avoid the same failure again. Complexity begets complexity, which is why I was referring to the dependency on the human elements who are involved in evaluating the failure and remedies.

tldr; Removing a process is risky and thankless for most part, no one wants to take that risk. So after every failure a new process gets added and thus you end up with an ever growing complex system