Because it's one shot, must work stuff. They don't build this type of equipment often (really ever) because it's all bespoke to this mission. That means they ne

Because it's one shot, must work stuff. They don't build this type of equipment often (really ever) because it's all bespoke to this mission. That means they need to build, verify, test, etc and it all has to work first time because there is only 1 shot (over a 1 month period) for the launch window