No, I didn't mean any of those. Can you believe it? The entire game seems designed to make you pay if you develop tunnel vision. Just spamming GS, for example, won't allow you to cruise to an easy victory anymore. More upgrades mean that you can fall behind faster than before with regard to a fighting force. The much bigger importance of navies makes focusing strictly on land units not so easy to get away with. With regard to religion, I meant that other religions can undercut yours, and your early relationships as a result; and even more, what you build up in religion will be undercut by the rise of secularism. You have to periodically shift gears much more than you did in vanilla.