Your fellow users would love to tell you how to make the best use of the Master Documents "Feature" but that would be like teaching a ten-year-old how to use old dynamite. It would be irresponsible given the inherent dangers of the product.

This simile is hyperbole, in that damage to life and limb is unlikely. On the other hand, damage to a career is probable. People tend to use this with books, theses, or other major projects. It can destroy the entire project.