What if +10 Maximum Population Limit was the Goths team bonus instead of Barracks work 20% faster?

With 4 players, that's an extra 40 population for your team. Some extra arbalests here, a few paladins there.. you could make a few more siege weapons. Or invest in trade carts and villagers. If your team can reach those high pops, it's a wonderful bonus. I certainly wouldn't mind.