Cities are delicate clockwork machines with complicated supply chains: the attacker might struggle against a city’s hacker weapons, but the city will fall because a city is complex and a city needs many specialty inputs to function.

Changing topic: you said upthread “[people are] vastly underestimating the difficulty of bringing a complex system like the economy up from a cold start. In my experience with complex systems that are much less complex than the economy, it can't be done.”. Your personal example is irrelevant because it is a single person trying to restart an economy. Cities recover after earthquakes (my city Christchurch 2010) and wars (I have visited ex-Yugoslavia) due to many independent actors working, perhaps not so much due to your “command economy” example. Capitalist individuals route around damage. Although I admit effective centralised government helped Christchurch recover quickly.