Without any deep knowledge, I was able to build at least a working board with a mcp server [1]. It’s always about the interface. I had to solder a few parts. Yes there where a lot of vias placed. Nice grid but it worked.
That said, outside of casual experimentation, I have almost zero need for an LLM to lay out my circuits for me. It's not just that I do have the deep knowledge, but there's so much more to board layout than routing. What parts I've worked with, what I have in inventory and on my PnP.
I also just really love laying out boards, and I'm in no hurry to give that up.
That said, I've found ChatGPT to be extraordinarily useful for part comparisons, getting second opinions on approaches, figuring out resistor divider values, troubleshooting drivers, and so much more it's difficult to enumerate.