On mobile, when viewing podcasts it only shows the latest episode for each category. There is no way (that I have seen) to browse older episodes. On desktop, older content is in the "previous episodes" portion of each category, which is unintuitive.
I would expect podcasts to be treated the same way as videos, where there is a landing page which shows every episode based on the category chosen.
I come from Dota 2 and played a bunch of HotS over the weekend. I was enjoying myself for most of the time but the last few matches felt kind of empty for some reason. The lack of items, collective hero leveling, no last hitting, no denying, felt fresh and exciting at first. But I think I must find some kind of deeper strategy to the game (which I'm sure there is) else I fear it will burn out fast for me.
I've had a similar experience to you, I spent a weekend with it and felt that I got everything there was to get out of it. Complexity is what makes MOBAs so deep and satisfying, but unapproachable as a result. by removing the complexity, HotS is a very approachable game with the depth of a puddle. By removing the skill floor they inadvertently brought down the skill ceiling to the point that I can't see anyone playing this for long periods of time.