I think it is also an important point that CIv has never set out to be a histocially-based game. Civ is a game with history as a setting, not the basis, and that is a big difference. It lets the game be more causal, much more about the fun experience over the trying to ensure any level of hyper-accuracy. It is and has been always a game first, and you can see that with things like TSL being an afterthought not a standard.
On the contrary, Civ has always used History as its data base and source material for just about everything it does. It is Historical Fantasy in its implementation, but the Fantastic elements are, themselves, historical in basis: historical 'Leaders' that are in-game Immortal, Civilizations that keep the same Unique characteristics for 6000 years, but they are Historically based Civs and historically based characters (even if, like Gilgamesh, the history is nebulous at best).
And, as a historian with about 7,000 hours of game time in Civ V and Civ VI, I can tell you that every time they get the history wrong, the game suffers.
That does not, by any stretch, mean the game has to be 'hyper-accurate' (whatever that means - I assume you mean sacrificing everything else in the game for historical accuracy?) - a game that is unplayable or no fun to play is not a game, it's a Punishment, meant to be sold to and used by the Masochistic - which is too small a market to sustain a computer game company, even if you include certain sports fans.
But, when the game misrepresents military history, you get Units that don't perform the way they should (Anti-Cav), or Units that are never used at all (Siege Towers), and when they misrepresent or just don't understand Historical Geography we get coastal cities that don't appear to be worth it, rivers lacking their historical importance to Trade and transportation, Tundra areas that magically support major cities in the Classical and Medieval Eras - which is almost as close to Pure Fantasy as an Immortal Governor . . .
And so on and on: I've been posting on this stuff for years on both Civ V and Civ VI forums, and have accumulated a fair number of positive comments and Likes, which I assume means Somebody Out There agrees with some of what I've written.
Of course it is a game first. More specifically, it is a
Commercial Game first, or it is nothing (unless one of you out there has a few dozen millions of Dollars/Euros/Tugheriks to finance a Non-Commercial version that plays exactly the way you want it to!). But it has always been a Commercial game (franchise) based firmly on Historical Events, albeit (the reason I'm on these Forums) all too frequently based on misinterpreted, misapplied, or misunderstood Historical Events and processes.