Yeah I sort of get that but, at least in my opinion, RP shouldn't be the only reason for decisions if your trying to present and educate about the game. And considering how many long explanations he did in the stream I do think that it is supposed to be educational concerning the gameplay mechanics. So he should mention gameplay reasons as well as rp-reasons.
Like, for example, watch the video that Quill18 did that released just yesterday. They also did a lot of roleplaying with their species, but they also did always consider gameplay reasons for their decisions and explained them accordingly. It still didn't go very well, since none of the playing parties had any experience with the game, but it was presented a lot better than the stream.