This would be because there are very, very few people, even among your programmers, that can actually consider all of the needed cases when dealing with "busine

This would be because there are very, very few people, even among your programmers, that can actually consider all of the needed cases when dealing with "business logic". So you end up having to have an ability to do something dangerous and disaster prone to keep the whole ball of crap from falling apart in a most splendid way.