The guests themselves make value judgments of whether this polite, motivated, knowledgeable, reasonably boring guy with a sizeable audience and good credentials can help them to spread their own messages without much journalistic pushback.
His audio quality is also not bad.
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Personal opinion: The interviews are far too long. I'd like an informed opinion of the best (as opposed to most famous or controversial or odd) guests. If a biology expert told me Lex's interview with Eric Lander was a Must Listen, I'd value that more than, "oh! It's three hours of Elon Musk, but his personal values are well-known and haven't changed."
I would listen to a few very interesting conversations unedited OR a larger collection of reasonably interesting, short, heavily curated conversations. I enjoy hearing about subjects I normally don't encounter, and some of his guests bring this experience. Listening to months of audio to find these gems is not for me.
I prefer a small group of podcasts that have shorter episodes, entertaining/engaging hosts, interesting guests,
I do sometimes have longer podcast conversations with people I know well but 20-30 minutes feels like the natural sweet spot for my typical interview.