They are skilled for sure, but that skill come through experience, daily and long hours. As a kid, I knew skilled carpenters and cabinet makers who could measure within a 16th of an inch on a 3ft board without a rule, (but they did check). Again, long hours 6 days a week 52 weeks a year on lots of repetitive measurements and cuts.
We don't work that way today in the industrialized and academic world. But we do have great thinkers who can create the next great advancement in CNC and etc!