I don't doubt that LLMs are extremely useful for making simple things quickly. I haven't been able to get them to write hard code on their own, though. I was trying to make a sound card with a Pi Pico the other day, and had crackling and popping in the audio. I kept telling Opus to fix that, it kept being absolutely convinced it knows what the problem is every time, and went through multiple iterations of being absolutely sure it will solve the problem this time (with every time bringing a different reason for why the pops are there), and spent $35.

In the end, it had written 500 lines, the problem was still there, and the code didn't work any differently. It worries me that I don't know what those 500 lines were for.

In my experience, LLMs are amazing for writing 10-20 lines at a time, while you review and fix any errors. If I let them go to town on my code, I've found that's an expensive way to get broken code.