That's the thing though, gameplay and story are not to be kept in separate worlds to be visited whenever one feels the need to immerse themselves in lore for whatever reason, story is supposed to inform gameplay. You're right, diplomacy in CiV isn't some incredibly robust system full of incredible nuance, and all things considered BE's ctrl+c ctrl+v treatment of it isn't too much of a downgrade in terms of mechanics, but that isn't really the issue here. The issue is that the AIs in BE have no personalities beyond what was written for them on what are basically interchangeable post-it-notes that have absolutely nothing to do with actual gameplay. If I'm playing CiV and I find an AI like Shaka or Attila right next to me I immediately know "uh oh, warmonger, better play accordingly", or conversely if I find Gandhi or Haile Selassie I know I'm probably going to have lots of space to peacefully expand. Civ BE, for all its attempts to hint that "this leader is the warmongerer, and this leader is the builder, and this leader is the gold hoarder", has 8 entirely interchangeable AIs who frequently behave in an identical fashion. There might be minor differences between them (probably more likely to be DoWed by SF and ARC than PAU or FI for example) there's no change in how the player reacts to the AIs because they all act like they have a checklist of things to do every single game. The lacklustre diplomacy would be a lot more forgiveable if the AIs weren't just generic space colonies one through seven and actually warranted a measured response from the player.