I don't agree entirely with all these, but I think 3 is the most compelling. It was kind of magical to younger me discovering the interoperability of podcasts and the freedom that granted listeners (and creators too). I've been a big fan of Spotify, but I don't like this recent push to fracture the podcast market with exclusive deals.

That being said it does allow some podcasts to exist that might not otherwise. The only examples I can think of is The Besties.