That was how I felt
Interesting take and I hadn’t thought of that, but I still don’t think it was worth putting in. The opening made sure to distance itself from the thrones story, and I don’t really see much benefit from linking the two narratives to that specific part of the ASOIAF world. Sure it gave an insight to their ethnocentrism, but I don’t think one was needed, they have dragons is enough
That reveal will come up in the books (lol) I imagine, as it’s been hinted at, and I think it will make more sense to me being included in there, rather than a spin off with no tangible link to that threat
Still really enjoyed it, thought they did a good job. Especially with the added complexity of it being the opening episode