I realized I was going to have to do it. They're meant to be as fun to read as any picture book on the shelf. In very subtle ways, they can be used as effective parenting tools. They're designed to help parents help their kids. They're not meant to answer every question, but serve as a springboard for more discussion between parent and child.
Nothing helps a child more than to know what to expect.
For someone who has been in diapers their whole life, this is uncharted territory. This is mysterious stuff. They don't know where pee and poop come from or where it goes. If you take some of the mystery out of it by answering questions, that takes the anxiety out of it. Then, that can take some resistance out of it.