I think you really underestimate the amount of dependencies (documented and otherwise) that exist in even medium sized company. I once caused a production outa

I think you really underestimate the amount of dependencies (documented and otherwise) that exist in even medium sized company. I once caused a production outage in a retail company that caused all cash registers to stop working. The team that worked on that had pushed in a last minute change and didn't test if it handed going offline gracefully. Right now I'm on call for an identity provider used by people in various timezones, including logistics workers in places that operate 24/7. Even when we do weekend upgrades, we still cause quite a bit of collateral damage. 10 minutes of time, multiply by the number of employees affected. It adds up fast.