I don't think there's any reason to put the default video embed at 1080p. Just wasted a lot of my bandwidth, honestly; I didn't make it full-screen or anything and would have been fine with 360/480p
It's great they put it up that way as that seems to be the native resolution the demo was recorded at. That way, you get the optimum display quality of the text. Since most of the screen stays the same much of the time, it isn't that much of a bandwidth waster after all even at the higher resolution.