I suspect they used US customary units because that's what's used in the video. Anyway, if we're only going to talk about readability then I'll note that the t

I suspect they used US customary units because that's what's used in the video. Anyway, if we're only going to talk about readability then I'll note that the text is imminently comprehensible to anyone with an intuitive grasp of said units. So the real question is one of functionality. (I'll put my vote in for metric, of course.)