[ChuckMcM]

There is a great discussion at the Kennedy Space center visitor's complex about all of the Apollo knowledge they are re-learning and improving on with the SLS. From trying to re-create the F1 engine (in the F1a) to spacecraft management systems. There are tales (perhaps apocryphal) about going to senior centers to talk to some of the original engineers. The narrative is very much that this sort of ship/endeavour was a lost art which they are recreating from artifacts, new research, and people who were there at the time.

I cannot judge how accurate that narrative is though.