Not to mention the time required for set-up. You need a completely cleared site with a perfectly level grade. You could probably finish framing a traditional wood home in the time it would take to just get the site ready for one of these.

And if something goes wrong you can just pop a couple studs out and fix it. And now you need trained engineers who can run, fix, and maintain the machine. What happens if it breaks down? The whole job site is shut down. And how many people in the world can fix this machine?