and from the way the hosts reacted to some of the survey outcomes (e.g. surprise that lots of people have too many ships to list), I don't think they have had a similar fandom experience to me or a lot of other people I know in fandom, which may have contributed.

Haven't listened to the episode, but having listened to the podcast before, this doesn't surprise me. One of the reasons I stopped listening is that I persistently could not relate to the way at least one of the hosts experienced fandom or the conclusions she drew as a result, and I also felt just enough subtle disapproving judgment of my way of doing fandom (a lot of "really? that's weird" kind of reactions) that it just got too stressful to listen to.