My first job was working in data centers for telecos and my impression was that everything was one cable trip away from never working again. Networks were real

My first job was working in data centers for telecos and my impression was that everything was one cable trip away from never working again. Networks were really complex, nothing was documented nor deployed as code, most equipment were untestable black boxes, people who deployed stuff moved on, etc... Just thinking about working with on prem again gives me chills. But maybe FB knows better than telecos, IDK.