I've listened to his talk (don't like to waste a recommendation) and as soon as it finished, I wanted to get your take on this - but I see you've already addressed it!
Here's what came up in the questions after the talk:
Q: Colonies in trees are well-insulated without ventilation - so why do we do the opposite?
RP: (much hesitation) I do understand the question - I really don't know the answer.
I don't think he really has a 'view' or considered position on this; more a case of, 'I've always done it this way, and it works for me.'
[It wasn't you, Philip, who asked the question by any chance?]