Why move Stargate warship production off Earth?

Why did Stargate's Earth powers not move warship production off Earth?

They should have considered lunar or Martian yards to exploit local resources, disperse risk, and expand production beyond one vulnerable planet.

Once Earth can operate Daedalus-class ships and Asgard transport technology, concentrating every construction facility on the home planet becomes unnecessary. Production could move to the Moon, Mars, or another secured location without a Stargate. Local mining and advanced transport could reduce material constraints while dispersal protects the program from a single planetary attack. The main continuing expense would become the skilled workforce and crews rather than hauling every raw material through an Earth-based yard. Off-world industry therefore improves both scale and strategic resilience.