Why would I agree that "LLMs are shit for any serious work" when I've been using them for serious work for two+ years, as have many other people who's skills I respected from before LLMs came along?

I wrote about another solid case study this morning: https://simonwillison.net/2025/Dec/14/justhtml/

I genuinely don't understand how you can look at all of this evidence and still conclude that they aren't useful for people who learn how to use them.