It that's the essence, then of course 9/10 is accident. I think that's not software engineering though.

The essence: I need to make this software meet all the current requirements while making it easy to modify in the future.

The accident: ?

Said another way: everyone agrees that LLMs make it very easy to build throw away code and prototypes. I could build these kind of things when I was 15, when I still was on a 56k internet connection and I only knew a bit of C and html. But that's not what software engineers (even junior software engineers) need to do.