One of the sidebars mentions that: "The production system in question is almost certainly a schizophrenic box of compromises brought about through poor decision-making, unaddressed technical debt, design-by-committee, and impossible timelines and budgets. This is not a system that any single rational human being on the team would’ve chosen to build if permitted to do so alone. Trying to assert ownership over an environment like that is just begging to get your shit rocked."
That’s basically every company and every system ever. Things are always in a state of flux, constantly being worked on. People come and go, priorities change and technologies evolve.