“How many people today know how to make fire, build a house with branches and twigs, make a spear and hunt in the forest, or forage in the woods, knowing which plants or mushrooms are edible or poisonous?”
Many still do, but the fraction that do, and the average quality of those skills, is vastly lower than before technologies made those things easy.
Many people in the USA have little or no ability with manual automobile transmissions. Many young people are afraid to be without their mobile phones. Many don’t know how to navigate without them. Cashiers in the USA are more and more challenged to make basic change during sales. Many young people are not being taught cursive script, and are becoming less familiar with using pen(cil)/paper for tasks. Etc. Skill degrade in distribution and quality when technology and common practices start to make them less common, even if they don’t degrade entirely.
The organization of infrastructure is another issue. International trade and distribution has moved most manufacturing outside the USA, which will be screwed if/when they lose access to it, or to the means to keep their transportation networks running.