And add to that the number of custom software are many times more than most things in real life. Nobody will asks for their BMW to transport a cow, or for their

And add to that the number of custom software are many times more than most things in real life. Nobody will asks for their BMW to transport a cow, or for their BMW to connect / communicate with other's Mercedes. But we often asked for accounting app to able to handle employee's payroll and paid leaves. Then with that many demand for custom software, we also got many times software manufacturer than car manufacturer. Inexperienced manufacturer (programmer) will make development even slower. Not to mention that the client even don't know what they want.