A counter-example I can think of is Drew Houston. http://mixergy.com/drew-houston-dropbox-interview/

If you’re interested in understanding how something like sales works I would literally just go to Amazon and search for the top rated few books on sales just read them ... I did that for books on sales, and finance, and management, and negotiations.

What's special about podcasts and videos imo is they can convey someone's mindset better than raw text on a page.