They have definitely built some of it in.

And yes, right now you still need the architectural and system design knowledge because the LLM will fuck that up. We'll all find out if that continues being needed in the future. From what I understand about LLMs and how they work, I doubt it, but also, yeah, I doubted it would've gotten this far when I think back 2+ years ago.

Also, maybe I should be clear, I pretty much never one-shot things. My sessions with claude or other cli tools always starts with a bit of a conversation until we converge on a good plan, claude builds the code, we discuss some more, then we iterate.