Ferocitus
Deity
There are some things that can still be tweaked that seem fairly binary (correct me if I'm wrong). One thing is that AI puts too much emphasis on not loosing units. This is on paper a sound strategy, but often hold AI back from doing actual damage to the human player. This is quite evident when you compare AI civs to AI barbarians: The barbarians will sacrifice any and all its units to kill a player unit, which makes the barbarians a real threat and nuisance. Imagine if the barbarian units could heal and get promotions ...
I know you can't extrapolate from just one point, but I had a very clear example of the AI prioritizing wrong in my last game (where the AI performed remarkably well all-round, and which I would probably have lost, if not some sort of mod error made me fail to finish it).
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It's those kinds of anomalous behaviours that will be valuable guides for modders.
However, that doesn't mean that a simple tweak, or weighting adjustment, will solve the problem, or do so without a raft of unintended consequences.
Some parts of previous mods like VP will be useful, but only the most AI-naive person could think that's all that's required.
It's the equivalent of thinking that you can push an AIturbo button and the game will magically behave as desired.
Look at the history of Civ5 or Civ6 mods and you will see how many iterations they went through before all the wrinkles were ironed out. What seemed correct when the mod was released and, in many cases, what looked like perfectly reasonable improvements at first glance, were very often exposed as buggy, or inappropriate when combined with other game features.
I know the AI is deficient in many aspects, but I can bypass those annoyances by playing on large (modded) maps against 20+ civs so that the AI's mistakes are not completely ruinous to my enjoyment of the game.
BTW, just so you don't think I'm a shill - I wouldn't touch the standard releases of Civ6 or R&F with a bargepole if it weren't for the Terra Maps, and even those splendid attempts needed a few iterations to eliminate some chronic faults.