The Griots and Spreading Knowledge

I believe that the spreading of knowledge and information through the use of Griots is insufficient compared to the textbook.  They spread information orally throughout the generations.  As it passes down from father to son and so forth, the original story is altered and is not the same as it was when it was started.  Without written history, the stories are not as credible because the original story was not recorded on a hard copy and will not have the same meaning.  The textbook is much more accurate with spreading information.  All that is written in the book is supported by historical evidence.  The information is derived from multiple sources and combined into one in the textbook.  The information used in the textbook is also the most recently updated and proven accurate information to date.