This seems like an awful way to read. Do you go to art museums to train your eyeballs? Do you flavor your meals so that your tongue will know the difference between spices? Why does your reading need any purpose, at all? What is the purpose of breath?
Good question. I used to read for the love of books and building a fictional world in my head. I do enjoy that from time to time now, but the nature of the value I derive from reading has shifted.
Using your analogy, it’s just that instead of frequenting art museums like I had before, now I have expanded my interests to business presentations, hackathons. Both generally provide audiovisual material, but we go to each of them for very different reasons.