Jesus was 'the son of god' and yet he didn't have that much to say when it comes down to it. Really. When you compile all the things he said, without duplication, it would probably fit in a one hour podcast.
Now, take joe rogan's guest. Let's say Alex Honnold. He lives a really interesting life and one hour into the podcast he would be struggling for things to say.
Should you listen to these public intellectuals you mentioned? sure. But after one hour or so, thats really enough to get an abstraction.
Because when it comes down to it : There's really not much to say.