So far in my experience watching small to medium sized companies try to use it for real work, it has been occasionally useful for exploring apis, odd bits of knowledge etc, but overall wasted more time than it has saved. I see very few signs of progress.
The time has come for llm users to put up or shut up - if it’s so great, stop telling us and show and use the code it generated on its own.
What else are you looking for?
Do I think those rise to "case studies"? No. But to another commenters point, detailed and rigorous case studies have always been hard to come by for any productivity process or technology.
I also think that article is hype, but it's not true that it's vague.