I've not read the books, so I'm not sure if there is any clarification on this, but I'm wondering why technology doesn't seem to advance in Westeros and Essos. In House of the Dragon series, well before the events of the Dance of Fire & Ice, we see King's Landing appears to basically be on the brink of industrial revolution. Certainly there must be some resource in Westeros which could be burned to produce steam power. I'm very curious to know why technology doesn't advance in this world, or are there pockets of advancement we just aren't aware of? Perhaps too much war has prevented advancement, but then again, history has shown that during wartime, nations tend to make a lot of technological advancements.