It’s not just “for an open world” it’s period.It’s insane. They level of detail is is unmatched for an open world game. Won’t be matched until GTA VI. And I’m not even sure Rockstar will go that far with it considering it won’t be primarily a FPS
It’s got more detail than smaller scale “cinematic” games too. From how detailed and intricate the city design is, down to individual bolts and rivets on the cars. It’s astonishing to me to consider an artist/developer had to draw and design all of this.