I sort of view that list as table stakes for a well rounded capable person.. Well barring the invasion bit. Then again, being familiar with guns and or other forms of self defense is valuable.

I think most farmers would be somewhat capable on most of that list. Equations for farm production. Programming tractor equipment. Setting bones. Giving and taking orders. Building houses and barns.

Building a single story building isn’t that difficult, but time consuming. Especially nowadays with YouTube videos and pre-planned plans.