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Yet another reason to avoid collapse.Along with that thought, vast knowledge will also be lost.
Rome invented arguably the best method/ingredients for making concrete a couple thousand years ago. That society collapsed, people lost that knowledge. It wasn't until about 1,700 years (!) later that an Englishman invented something close to what they'd done.
Twenty first century methods and materials are even more complex, and known by fewer people. Collapse will involve not having a whole lot of things.