It's not about playtesting, it's a problem with the makeup of the game, and has been an issue since the game came out (or at the very least since I bought it).
European civs make up 19 of the 50 civs, or 38%. Europe is one of the smallest continents. Combine the two and it's a major issue for an Earth TSL map with random civs. The same problem happened with the other Earth TSL, you had to manually set civs in order to make sure that nearly half of them didn't go into a tiny fraction of the map.
There are solutions:
- Make the map big enough to cope. Not only would that make it unplayable for many, but it would also result in huge areas of the map being deserted and boring. I was alone in the Americas in my last game.
- Manually set civs so you get a nice spread (the original solution).
- Have the ability to ban specific civs and CSs to allow randomness but also to control spread (a feature we received a few months ago).
- Distort the map so Europe would be disproportionately larger. It will never get large enough and, frankly, we'd just be swapping this complaint thread for one about eurocentrism.
- Pump the game full of non-European civs so that European civs are less likely to be picked at random. Surprisingly, the reaction to that and similar ideas has been more negative than I expected.
It's not that it hasn't been playtested, we've had the same problems on a similar map for years. The problems are geography, history, technology, the fundamental mechanics of the game and the attitudes of the players. None of that was going to be rooted out by playtesting.