Yeah, and what do you do in that situation? Suddenly you need to make some serious choices about how to play the game. You could go out and find some horses, and invade someone, trade for horses, use that to build a horse army, invade for more. You could choose to do something else during that time period, build another army type, or find another way to win the game. That is infinitely more interesting than the choices on offer now and it made a player have to actually think about what they wanted to do.