Looking at the opportunity cost lost by four minutes of downtime without comparing it to the increased cost of not doing continuous deployment doesn't seem like

Looking at the opportunity cost lost by four minutes of downtime without comparing it to the increased cost of not doing continuous deployment doesn't seem like a fair comparison. Also, with huge monolithic deployments, the risk of much longer downtime is increased. If you can get deployments into non-events, you don't have as many catastrophic problems.