If you have the building produce boost+1 you do balance the goods instead of overloading the world with only 1. However, you also reduce the need for trading. You now have 2 goods in the tier and only need to trade for 1 other. I think that would reduce the dependency on others since you would only need to trade for 1 good in that tier. In past post, I've suggested +2 instead of +1, but if there are both +1 and +2 building in the same tier, you can reach the point where no trading at all is needed. In my opinion, that would reduce some of the appeal of this game.