Are you crazy? How is loving to watch documentaries an indicator of the inability to learn through reading? For instance, I love reading about WW2 and love watching documentaries on it as well for the real footage shot by real people who went through the war. This is just one example. There aren't always good books on contemporary documentaries made these days as well. So in this case documentaries allow you to learn beyond what's available in books. As someone who actively seeks knowledge, I don't understand why learning from books or any one media is superior to any other. Also why are you hoping "they're not confusing the two in their measurement?" What do you have against documentaries???