I also have used llm assisted coding and I'm not sure I agree. superficially it seems very fast but then coding using modern languages and libraries (I use Rust and ofc cargo) is also extremely fast these days. when I use LLMs I often have to spend significant time correcting errors made by the LLM and I estimate the time gain to be negative in these circumstances.
admittedly in certain cases , for example building boiler plate to get database rows into structures, LLM coding is spectacularly faster than my manual effors because I struggle at repetitive detail work.
Digital circuits are made from analog parts. -- Don Vonada