I mean you can get good stuff out of it if you know what you are doing and guide it, but if you just say “here’s a regression suite. Write an implementation that passes” you will get something that works for a while but ages quickly and will need to be thrown away.
Apple releases the M15, and using everything leaned while building drivers for the M4 - M14, the LLM just does the whole job and we have the drivers a day later.