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I haven't listened to the podcast, but a valid argument might be that the space is sooo large that global expertise is simply not possible for a single human?

Well, it's not really about the global expertise...

"it's not really about the global expertise..." idk, If someone says they are an expert in Python, for example -- I expect that person to be able to answer almost any question I have in the Python space, same for expert mechanic, carpenter, etc. Generally, being able to do so requires significant time and exposure (exposure as a percentage of the available knowledge.) If one chooses that definition of expertise, which I believe to be a reasonable one, then one could say that platform engineering is so large and so new that no individual has either had significant time-exposure nor can claim a large percentage of knowledge of the entire space. I think this is more true for very dynamic technologies in which the space is ever changing. No human can keep a current mental model of the entire space.