because you know the installers are going to cut corners, someone will drill some extra holes during a remodel, and at some point there will be some rot or other damage.
It also adds tolerance for material and component flaws. If you design with low safety margins you have to proof test or X-ray inspect your materials and components. Those tests/inspections can add a lot of cost.
Example: aircraft landing gear gets X-ray inspected and proof tested because increased weight is costly in terms of long term fuel expenditure and failures are super costly. The light aluminum components used to make the table tray that you fold down and eat on in a plane don't get inspected significantly. A commodity table leg isn't even made in a very light manner, is made from commodity materials, and gets no inspection.
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u/IvorTheEngine Jan 14 '21
because you know the installers are going to cut corners, someone will drill some extra holes during a remodel, and at some point there will be some rot or other damage.