While this is true at a surface level it's another exponential process (within reason and limited by logistics). You build your initial factory and every robot produced does nothing else but bolster the infrastructure necessary to build more robots until you hit some critical mass of production and then send them out to do everything else (all calculated and coordinated by the AGI). That's the smartest thing to do but it relies on the government pulling their heads out of their ass. Instead we'll probably continue to rely on capitalism and draw the whole fucking process and pain out way longer than necessary.