Broadly speaking, Preston is too much inclined to offer "in world" analysis, based on his perception of what would be logical (or inevitable) given the laws of physics that he imagines operate within that world. My analysis, instead, is based on the will and intent of the author (George R.R. Martin), with the assumption that these "laws of physics" are his playthings that do not constrain him (in communicating whatever moral or message he wishes to convey).
My comment was posted to Preston's newest video, where (in the conclusion) he invites questions (or objections?) from the audience, here: https://www.youtube.com/watch?v=vYXNZVsQPIQ