Just because we know how to build a lighter/stronger bridge doesn't means every bridge in the country will suddenly be lighter and stronger. Someone has to go out and actually build those things.

But, one can imagine a future where the design of a new factory line is done in seconds by an AI, and assembled by machine.

So, I can see where people, especially in this particular sub, could imagine new factories popping up where the curing time of concrete is the only time factor.

I'm not going to tell them that'll never happen, but having worked to create automated systems on factory floors, I know that right now it takes months to get some basic wiring purchased and installed.