==it's worth keeping in mind that what looks like redundant waste is sometimes an important guard against some kind of failure. Just because it isn't always use

==it's worth keeping in mind that what looks like redundant waste is sometimes an important guard against some kind of failure. Just because it isn't always used doesn't mean that it's not worthwhile.== Even more likely is that the redundancy exists because of something bad that happened in the past. That is how most regulation comes into existence.