Why is the Invention of the Gutenberg Press So Significant?

Before the Gutenberg press, books were written by hand, by scribes. With this type of process, creating a book was obviously a slow and tedious production. Gutenberg’s press signifies the beginning of mass reproduction. But why is it so important to graphic communications and the way society communicates today?

Take look at this short video I found on YouTube. After viewing the video, what are your thoughts?