"I mean, corporations are irrelevant as are most of the new
military units." Mining Inc and Sid's Sushi are not at all irrelevant, and in fact are way overpowered. I always try to stockpile a Great Engineer and Great Merchant midgame, and rush to acquire Railroad and Medicine so I can build these. But to answer the original poll, yes, I quite the game after I know I've won or lost.