The world of software development is just different. Copying software is a solved problem, it is easy, cheap and totally normal. Whenever you start your software it is going to be copied around a few times. So the trivial "same bridge as last time, just over the next river" doesn't really exist in software. The software world has that situation solved, you get your software plus the (if so inclined) recommended OS and hardware to run it on, install it and you are fine. You can do it 1000 times over and verify that things are the same. You can even do it automatically. You can do it 1000 times over on different hardware, just rerun the test suite if you are paranoid, done. This is the level of triviality that is solved by licensed engineers when doing bridges.

Now in a few years, when maybe 3D-printing for buildings takes off, all that "fun" that is now bespoke software development will also arrive in architecture. THEN things will really be ugly ;)