Complexity explains it because the parts are not certified. In real engineering, parts tend to have precise specifications and sometimes must adhere to strict c

Complexity explains it because the parts are not certified. In real engineering, parts tend to have precise specifications and sometimes must adhere to strict certification and testing. Outside of specialized areas, this is not generally the case for software libraries. If you accumulate such software libraries you cannot get error or failure estimates/models, and the result will be buggy no matter how careful you program or test or which programming language you use. The only remedy is to reduce complexity and/or develop everything in-house according to stricter rules.