Citation needed for your second sentence. This is the problem with AI hype cycles. Lots of outstanding claims, a lot less actual evidence supporting those claims. Lot of anecdotes though. Maybe the LLMs are in a loop recursively promoting themselves for that sweet venture funding.
Studies take time. https://www.microsoft.com/en-us/research/wp-content/uploads/... is the first one from Microsoft. But it goes back to gains coming as people become more skilled.