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Some of the things we know and love about Nier and its connection to Drakengard are from Grimoire Nier, a companion book that was never officially translated to english.
No one seems to have an issue with that.
At least Cosmogony is part of the actual game.
That would be awesome!
It's not a good story, but you can follow it just fine. It makes sense in the narrative flow.
When I hear people talking about super convoluted and nonsencial stories, I think of being unable to even understand what's happening. Being able to follow everything but thinking it's garbage is a different issue. Or at least that's the way I see it.
But what about the history of Eos? You're not around when Bahamut comes to Tenebrae and chooses his Oracle. You're not around when Insomnia closes itself inside its walls 30 years ago, and the rest of Lucis gets cut off from technology. You're not in Tenebrae when Luna is talking to the press, so you listen to it on the radio. There's no reason why people would come to you and give convoluted explanations about that world, so Nocits only hears it if you want to hear it, through optional stuff.
Souls games also have the current time plot, in Dark Souls it's link the flame and succeed Lord Gwyn, in Bloodborne it's halt the spreading scourge of beasts to escape this nightmare. In FFXV it's Reclaim Your Throne.
I don't think FFXV is nearly as good as Bloodborne, but I also think there are similarities. And I don't think they're just accidents, with the way they're paced. There's a very obvious lack of direct, mandatory storytelling concerning events that Noctis isn't a part of. We see the story through his eyes, so we only read and hear about things when Noct isn't there, with a few exceptions.
I'll say it again in case it's not yet clear: I don't think it succeeded completely, and I think there should be more cutscenes, including off-screen events that Noctis isn't a part of, but it seems like a conscious decision to me. At least when it comes to the larger lore of Eos.
For the main character-driven story? For sure, any similarities comes from issues with the narrative. I agree.
But all the similarities for world building seem very conscious. I immediately thought of Souls too when I first started to explore the lore through the game, but didn't mention it before because Souls is pretty much all I play these days, so I just shrugged it off as "what else would I compare it to?"