I would completely disagree with this. Particularly with how common mobile devices and tablets have become. In fact more people use mobile devices or tablets than computers for personal use. Combine that with the fact that we are all online, nearly daily. With the frequency of blogs, social media, and countless others using tags as the main way of organizing things online.
I disagree that classical folders are easier to understand. This is a very linear or binary way of thinking and our world has moved so far beyond that. Even as an old bloke, I find tags much easier. I seldom toss items in one bin and my podcasts certainly are the same. Not to mention, many podcast creators already use multiple tags to identify their podcasts to gain new listeners.
Regardless of what you do, and I would personally love to see tags implemented, I completely agree. Do not auto categorize without explicit consent from the user. Though, I don’t suspect you would do this based on other things I have seen you say in the past couple of days.