Think of it this way, the Persian rug isn't the same pattern every time either. The base job is the same, but the implementation requires planning and the like. A rug making machine is good at creating the same thing over and over again, but not very good in being flexible.

Software... a lot of software is basically the same thing (database, api, frontend), the only difference is what data and business rules. But the act of writing code isn't very different. It's the what code to write where software engineers come in.