If its broken - it is commented out, or opt in via parameter. It is not shipped - AS IS and then when after weeks and weekends the bug is found, you dont just pose yourself at the wall of the crater - lean down and yell. "Well this is just great, you discovered a cavern. With the sweat of your brow, this could be a nice house one day. Allmost like the one we promised to deliver in the first place."