It's not that traditional timber-framed structures were designed for disassembly; but because they lack metal fasteners, modern adhesives and cementitious elements, their construction happens to be completely reversible. All of the components are made from wood that slots together, cleverly held in place with small wooden pegs. Remove these pegs, and the components can be non-destructively separated.
Thus Japanese carpenter Dylan Iwakuni and his crew have been hired to disassemble a 92-year-old timber-framed home at an undisclosed location in Japan. (The point is to move it and reassemble it elsewhere.) In this video, you can see them carefully knocking and teasing the components apart, occasionally revealing some fiendishly complicated joinery that's been quietly doing its job for decades:
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Not every piece will be carried over, of course; Japanese cedar is hardy, but some of the components are too weather-beaten to save and will be recreated by Iwakuni and his crew. Nevertheless, it's hard to believe the entire structure can be dismantled and most of it reassembled at the materials cost of a bunch of new pegs, plus whatever replacement pieces are necessary.