Wasn't that the OPs argument? Companies have been building tunnel after tunnel [..] and optimized the process. No one had tried to large scale industrialize satellite + space launcher production before.

Space launch still isn't a mature industry, what are you talking about?

NASA procurement was (is?) full of pork barrel politics meant to provide jobs in as many states as possible. I would expect a lean private organization to easily beat NASA in cost per launch. What SpaceX has done is very impressive, I have a lot of respect for what they’ve accomplished.

Space travel is also far less mature than tunnel boring technology, I’d expect advances in space travel before tunnel boring because there’s low hanging fruit. Space travel used to be done only by nation-states, only in the last 25-30 years has private space travel been possible. Tunnel boring machines were invented 200 years ago and were useful about 150 years ago.