There is more to development than domain knowledge. There are decades of wisdom about development best practices on how to keep a large codebase maintainable, performant, testable, etc. that LLMs frequently don't follow. And now humans aren't practicing those skills either or passing down lessons learned to the next generation of programmers.

Maybe it will be no big deal, and nobody will read code anymore, but it is understandable why somebody might be concerned about it.