Troubleshooting charts help you start at the beginning and not skip steps.
Techies are often very linear thinkers. Linear means straight line, cause and effect. We like it when we can be certain: “This happens, then this happens, and only then does this happen.” Doesn't that sound like the perfect world? Doesn't that sound a lot easier to deal with than, “There are a lot of things going on all at once and we're not sure why”?