Successful cities need a variety of infrastructures, such as roads, electricity power plants, network connectivity, water and sewer lines, and so forth. At small scales we could probably design this infrastructure to be completely modular. But that approach doesn’t scale, at some point we need expensive fixed infrastructure, like multi-lane highways, bridges, water mains, subway lines, airports, which only make economic sense if built on a geographically stable foundation. Such infrastructure wouldn’t be feasible in a “dynamic” city, and without such infrastructure it’s hard to imagine a city of even modest size being viable. It could be a good place to spend a vacation, but no more than that.