Where immersion is really destroyed for me is when the AI stops advancing to victory, and suddenly it feels like all pressure is off (e.g. not using banker, not starting science projects). It’s a small-ish issue, since it only affects the end game, and my goal remains to win as fast as I can once I get to modern, but I want to feel some peril, and to have to ask myself, “do I need to interfere with Ben before he wins on science?”