Interesting observation. Repetition may be natural, people don't follow 1000 podcasts, but maybe one or two. Therefore, every podcaster will almost be expected by their audience to cover many/most aspects of the topic. In fact, a podcast will largely do their own learning by having conversations with the same experts that already appeared on the 1000 other podcasts, i.e. the podcast essentially documents the podcaster's own learning journey.
I agree that this does not necessarily contribute to existing knowledge, however it creates a kind of learning community. Almost nobody wants to listen to old podcast episodes from a few years back, and they also want to interact with the podcaster on social media. So, it won't push the state of the art, but it will onboard new people who could one day contribute to it.
There are ways to justify it but the incentives are there, don't you agree?
Old podcasts are not bad if they are still considered relevant. We can move on from them if they are not relevant anymore.
I think there is an incentive to repeat old content, yes. Then you're in "commodity" territory. But there is also an incentive to generate new knowledge, which puts you in the thinkers club, who get invited to all the podcasts.
I hardly know anyone who listens to old podcasts, except if they are specifically interested in something niche, or the episode is so good that it's become sort of a classic.
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