Chemical and elemental properties of the walls and wall paper can matter though. Leaded paint, Aresenic, flammability, weight (steel walls vs sheet rock). The

Chemical and elemental properties of the walls and wall paper can matter though. Leaded paint, Aresenic, flammability, weight (steel walls vs sheet rock). The complexity is still less than software though, and there are much better established standards of things that work together. Even if a screw is slightly wrong, it can still work. In software it's more like, every screw must have monocrystalline design, any grain boundary must be properly accounted for, and if not, that screw can take out an entire section of the building, possibly the whole thing, possibly the entire city.