Think about it. To make the game historical, you would need to merge Old World, Crusader Kings, Europa Universalis, Victoria, and Hearts of Iron, and you still would not have quite covered the whole period. Can you imagine that working?
I see too many posters making the same false assumption: that there is a hard Historical Versus Game dichotomy.
Not So.
Whether a game is Historical or not depends on your sense of history. The more history you know, the more any game or recreation has to work to appear 'historically accurate' to you. The other side of that is the more 'history' you know that is inaccurate the less you will think an accurate historical rendering is Historical.
Everything, always, has to match your perceptions, and by the time anyone is old enough to play a computer game like this one, they carry with them a lot of pre-formed perceptions that have to be satisfied.
NO GAME or anything else will match all those perceptions.
But any opposition between Historical and Playable will be on a sliding scale with a distinct and different point on that scale for each and every one of us. I will put up with a lot of mediocre gameplay to satisfy my interest in history. You may have no interest in the history other than as background noise while interesting play is immersive to you.
To some extent, the game has to satisfy both of us - at least somewhat. It is that constant set of compromises that is Game Design at its most basic.
So, the better expression of your statement is that:
"To make the game more historically accurate, you would need to merge elements of Old World, Crusader Kings, Europa Universalis, Victoria, and Hearts of Iron - and Settlers 6, Pharaoh, Caesar, Rise of the Middle Kingdom, and every other game with a semi-historical background to it, and you would still, inevitably, leave something out that is of Utmost Importance to someone."
"Leave out the Defenestration of Prague and it will never sell in the Czech Republic!"
- Or something similar: we've all seen posts like that one on these Forums about almost every in-game or proposed in-game mechanic or device: all such decisions, of all kinds, are some form of compromise between All Inclusive Historical - which is both Impossible* and Unplayable, and Purely Fantasy/Imaginary, which is both Chaotic and also Impossible to Play.
- Not that there isn't someone out there who is willing to try.
* I Know Whereof I Speak: I have spent the past 8 years working on a book covering the main aspects of the Battle of Moscow in October 1941 - with unprecedented access to Soviet and German archives from both sides and memoir and other materials from both Germany and Russia, and there are still things that we don't know about what happened - and never will know short of Resurrecting the Dead from the battlefields and questioning them.
- And that's one incident in one fraction of the planet's surface for one month out of 6000 years. Completely Historical is as much Fantasy as History: the best any human construct can do is, like Diodorus of Sicily, present a
Library of History that includes as much of the Neat Stuff as he could find, that he thought was important. And, in Game Terms, have enough people agree with him that they will buy it and want to play it!