The cut content in FFXV was so massive they could have made two new games out of it. Just use this picture for reference, all the regions in Niflheim have names and lore that you, of course, never hear about because you're stuck on a train for the second half of the game and never get to explore any of it. I didn't even know Tenebrae had a capital named Fenestala because it was never mentioned in the storyline, so I always assumed Tenebrae was the name of the capital since the whole region was just background in one cutscene. Can't you see how fucked up that is?

Maybe they can release the compete edition with cut contemt add back to game someday, like Xenoblade X defitive edition did.