Regarding Eurocentrism, I think 18 civs is too small number to have enough variation and arguably leads to Eurocentrism. For example, let's try to limit Europe Civs to just six.
Europe
Greece, Rome, England, France, Germany, Russia *
*(i pulled a CiV and omitted Spain to trim the numbers)
Six civs isn't much right? Well it's still 1/3 of the total. So still Euro-centric by volume right?
Now try to tell my why any of the above Civs should not be in the vanilla 18. Consider the classic, medieval, renaissance, imperial and modern ages. It's not easy to remove one, is it? I only removed Spain because it was already done in previous game.
But there's still 12 more Civs to suggest. And four more continents; Asia, Africa, America and the Middle East. So, three each?
Middle East:
Persia, Arabs, Ottomans (one ancient, medieval and more modern power, and judging by the other threads would be surprising omissions)
Asia:
China, India, Japan (covers all eras, Japan could be replaced because it was isolated but for WW2 scenarios)
America :
Aztec, Inca, United States (again US for WW2 scenarios, no native NA civ)
Africa :
Egypt, Mali, Ethiopia (North, West, East as well as the previous criteria)
And with a full list of 18 civs (1/3 of them Europe+United States) we have absolutely no new Civs. They're all staples at this point. And it's not easy to argue for any of their removal over another civ. We could cut Europe down further or increase the number civs in the base game.
In order to have new civs in each base game, the Devs do have to make tough choices. Simply swapping out some African/Middle Eastern civs makes them seem disposable if they change in every game. And massive areas still unrepresented.
I wouldn't want to be in their shoes. :/