Honestly, a lot of things make more sense with either the FNC or Versus XIII in mind. The lyrics of Somnus and Omnis Lacrima make more sense since they refer to Bhunivelze, Etro, Lindzei, and Pulse. Hearing the voices of the dead makes more sense with the Unseen Realm in mind. Noctis being rather nonchalant in comparison to everyone else who has ever taken a suicide mission makes more sense when your nation worships the goddess of death. Notics dreaming he's in a more interesting game when the theme of "sleep and death touch" comes into play. Why the Fal'cie, I'm sorry, Astrals are mostly jerks makes way more sense.
Feels like the rating issue with reaper worship and Square-Enix repeating the mistakes with Crystal Tools on the Luminous Engine were the root of 99.9% of the game's problems.