History Isn't What It Used to Be

Tonight was Back to School Night for D4. The Queen and I calmly moved from class to class one at a time (in contrast to the confusion when we go for D1, D2 and D3). When we got to the last class - social studies/ancient civilizations - the teacher, a very bright, energetic man, was expounding on all of the great things the class would be learning this year. "Only problem is our textbooks were published 10 years ago. We need to get updated versions."

Here's my question: If the kids are studying civilizations from thousands of years ago, what difference does it make whether the book was published in 2001 or 2011? As long as all the pages in the book are intact, shouldn't that be enough? Or am I missing something here?