In my opinion the elephant in the room when talking about informational podcasts or video is... text.
As a medium, text is just so much more efficient (at least for me) that I can't begin to imagine why one would want to listen to a piece of content instead of reading it. I scan-read 20 articles faster than I could hear (or watch) a single one of them if they were presented in audio or video. And doing so I still have my ears available (for coworkers at work, for example).
Video can be interesting in a few specific cases : music production is a hobby of mine, and video can be interesting (but not always) as you can simultaneously watch somebody doing something while hearing how it affects the sound.
But most podcasts (and youtube videos) do not exploit the unique properties of audio or video enough to justify the tremendous requirements they ask on my attention span.
In my opinion audio and video emphasize entertainment over information, but most of them are not that entertaining (compared to an actual entertainment media), and not that much informational (compared to a text article).
I think newspapers made a tremendous mistake with the pivot to video and the pivot to podcasts. Vive le texte !