As an economist Cowen knows that the more conversational market for podcasts is already saturated, and decides not to pursue it. I personally prefer that the questions Cowen makes show that he knows rather well who he is interviewing and why. Someone like Lex Fridman is in comparison less prepared. The downside with Lex's style is that some interviewees are so used to do a performance talk on their work that it's like listening to a broken record -- those who know nothing about the person get to hear a shallow introduction, whereas those who know the person learn nothing new compared to the papers, books, or other youtube videos.
Like, if you have been on a podcast yourself you might prefer Fridman kind of discussion in which you can quite freely lead hence get your agenda across. It is quite clear many visit Fridman because they know they will get to sell their ideas.