People make productivity arguments for using various languages all the time. Let's use an example near and dear to my heart: "Rust is not as productive as X, therefore, you should use X unless you must use Rust." If using LLMs makes Rust more productive than X, that changes this equation.
Feel free to substitute Y instead of Rust if you want, just I know that many people argue Rust is hard to use, so I feel the concreteness is a good place to start.