I’ve already mentioned multiple and went into detail in other posts, but if you want to hear the most egregious ones:
Tangut assets in the Khitan civ: Those two groups are completely unrelated, and yet the Khitan have a unique unit that was only used by the Tanguts in real life, and a castle sprite based on a Tangut fortress. Again, no relation to the Khitans, thus this fusion is counted as an inaccuracy.
Xianbei units in the Wei civ: It appears the designers confused two different states, Cao Wei and Northern Wei, and fused them together. The former is from the Three Kingdoms period, the latter was founded much later, and was created by a people known as the Xianbei. The Wei have assets from the Xianbei too. Thus it’s very inaccurate to fuse these two kingdoms, and shows very poor research has been conducted.
Wizards: the campaign has wizards. As in actual magicians. Obviously not accurate to real history, where nobody has ever summoned storms using magic.
Liu Bei: the hero unit, dual wields giant swords and has a special ability where he does spin attacks. Inaccurate because that’s physically impossible, especially egregious in a campaign that is being marketed as being “immersive”.
War chariot: war chariots weren’t used in that time period, and repeating crossbows were not siege weapons, nor were they ever mounted on chariots. Inaccurate.
Conclusion: this DLC has more inaccuracies, and more serious ones, than any other DLC before. Example: Dawn of the Dukes, the Obuch is a cavalry weapon but the unit is an infantryman. Very small issue if we compare it to the new DLC.
Also I noticed everyone who defends this DLC, never tries to argue why the 3K civs fit the game or why these design choices are actually fine. It’s always just “but other inaccuracies exist” or “it doesn’t matter”. Nobody has ever argued positively for them (outside of gameplay, but we’re not discussing that right now), just trying to attack other’s arguments without ever giving their own.