The difference is that the LLM will -probably- make an attempt to follow my instructions, whereas there is an even chance that the junior dev will decide all that pedantic reflection is below their genius, and will launch straight into hacking together something that usually works fine within its own scope, but has to be mostly thrown out anyway.

Structure exists for a reason, and I say that as someone who loves to go into deep hack and produce some ultra clever jamboozle that works spectacularly well, as long as you don’t ever have to touch it. In production, there is no worse code than clever code. It’s soul sucking, but we have to make peace with elegance = maintainability / portability. Often, that means 30 LOC instead of ten, but future you thanks you, and the (modern, optimised) compiler doesn’t care.