Why does no one remember Dalamud?

[Cleretic]

One thing to take into account here is that in the grand scheme of things, Dalamud was never particularly large in the sky or terribly prominent. This was never a "there's two whole moons in the sky, this is so fantasy!" situation in this game. In earliest 1.0, it was a little bit bigger and brighter than say Venus is viewed from earth and barely larger than the stars around it. It was more of an accent to the real moon like a tiny little mole hanging off the side than a second full-sized moon like a lot of you seem to insinuate.

Think of the 6 different colored stars in the sky in-game and that’s what Dalamud was like, being the of similar size, except that it was only around the moon. We don’t exactly hear about what different cultures think of the giant green star in the sky outside the AST quests.

So perhaps the reason the Azim Steppe doesn't talk about Dalamud is because they didn't really think of Dalamud as a moon. It was on a scientific definitional level, and Menphina's faith called it a moon, but who says anyone else did? When it was up there it didn't necessarily look like one. Just like how Earth has plenty of moons, but also only really has one moon.

Maybe the only reason Eorzean faiths and knowledge called it a moon was because that was just a lingering relic of Allagan knowledge.