People have always asked me why I never got into movies, YouTube (except for music), or TV especially movies and TV shows based on books I have read and liked.
The most important reason is that I learned to read before I had even heard about movies and TV which hadn't become popular yet. I read everything I could get my hands on. I once had a race down a school library book shelf with another reader friend of mine. I had an adult library card at 8 yo. courtesy of my activist mother who went to bat for me at the local library which I used almost exclusively as the young adult section books were off limits to my elementary card. I frequently strayed into the adult fiction section and found that I could learn about important social issues there more efficiently than in the news or the history sections. A good fiction author must write believable stuff in order to sell no matter what the genre.
For me the most important advantage of text is that you must supply your own emotional context to text. Visual and even aural media are designed to manipulate the emotional state of the consumer. Humans are story driven, and the invention of writing gave readers much more control over the emotional impact of the story. Not completely, of course, a good writer can influence the emotional content of his words, but the reader has a chance to process that emotional content at leisure if desired.
Another advantage of text is that it clearly indicates the intelligence, education, and sophistication of the writer by asynchronous textual analysis. A speech or video may sound plausible, but analysis of the transcript is critical to evaluating the plausibility of the actor.