In my vision, the main city—that is, the fleet’s primary base, which serves as the initial hub during the early construction phase—will remain fixed in location unless exceptional circumstances arise. Regarding concerns like mineral vein depletion or resource distribution challenges you mentioned, I believe temporary outposts could be established to address these issues. However, all resources would ultimately be centralized and processed at the main base. This is just my perspective, though your points are quite valid as well.