I'm going to start by ignoring this entire thread up to this point and doing what the thread title actually says.

First and foremost, I ignore what little lore there is surrounding the Nier raids. Besides simply not enjoying them - I know now to avoid playing the original game as well - the whole thing is an outside context problem that does very little do affect the world outside of disappearing a pair of dwarf twins.

I also ignore the lore that Exdeath was from a children's story that Nero heard as a kid - as far as I'm concerned, Sigmascape was as out of left field to them as Deltascape was.

I also ignore that they declared the Seventh Umbral Era over after ARR - 5 years does not a dark age make, and they still had a world war going on - none of them really lied to themselves and pretended that they had done more than win a battle, and that the war itself was still more or less raging.

The last one I can think of that I ignore, I ignore primarily because the writers have been quite inconsistent about it: the implication made in a few places that interracial relationships are considered taboo (most prominently with the NPCs who start the 'Not Easy Being Green' quest where they imply they were ostracized from their village not because they were gay, but because they were different races.)