I wouldn't say it is an exploit, rather a decision. You lose a lot of things from not finishing techs as well, you know. Like getting worse chops and harvests, which is huge in my opinion. Also you are wasting science by sitting on 1 turn technologies, if my understanding of overflow is correct (it never is :>). It's all about finding the perfect balance! 21 Cities at t100 and still going strong with Knights and Crossbows! Managed to get to Research Labs at t111 which is a new personal record. This might actually turn out to be my fastest game so far, doubt I can beat your t190 victory though since I only have Campuses and barely any Industrial Zones or Commerce Hubs..