There are a lot of things that can go wrong when you have insufficient design controls. The obvious outcome would be a decrease in quality which can put your costumers in danger. Sometimes when the design control is too detailed, it can make it very difficult in the future to change a process. For example, we had an increase of defected parts with depth issues. I can’t recall exactly what the issue was but it took awhile to come up with a solution that did not involve having to change the design controls.