That is almost to say that the only part of the project that matters is the code. But the code is only a tiny part. I take joy in describing the thing and bringing that vision to life.
That's what management pats itself on the back for doing, the only difference being that it's taking credit for the work the LLM does instead of taking credit for the work of human subordinates. The trope of the "ideas guy" is derided for a reason.
E.g. if Steve Jobs had simply handed a slip of paper to a team that said "make a new kind of computer", then no, he would not have brought the Macintosh to life.
They are two different things, LLMs are not humans.
I'd also say I've worked with many engineers over the years who were more focused on the software engineering aspect that the user experience. Depending on the use case for the software, that can absolutely end up being the limiting factor.