I disagree that we don’t have the knowledge or the people to accomplish a second trip. iPhones have more computing power than the whole damn Apollo craft. We clearly can do it again.That's the whole science vs engineering
We know how (science), we forgot how to (engineer) and yes mfg and building is a HUGE part. There is a ton of 'craft' is getting things 'right'
I think the real revelation is that what’s broken is government. In the 1960’s, we still had a government that was capable of functioning. They wrote NASA a blank check and put no-bullshit people in charge of seeing it done. Nowadays, a $1,000,000 part from the 60’s would cost $1 billion, and not from just inflation. The permit to manage the stormwater runoff from the parking lot of the plant required to build the part would cost $1 million. And then .gov would make them dig detention ponds to clean the runoff, spend $25 million monitoring endangered turtles, and $50 million on paternity leave for the engineers annually, etc.
TLDR: government has gotten so bloated, corrupt, and beholden to regulations written by self-important bureaucrats that the efforts of even the best and brightest engineers with bleeding edge tech are strangled to nothingness.