Why haven't we seen an explosion of new start-ups, products or features? Why do we still see hundreds of bug tickets on every issue tracking page? Have you noticed anything different on any changelog?
I invite tptacek, or any other chatbot enthusiast around, to publish project metrics and show some actual numbers.
In my personal experience (LLM and code suggestion only) it's because I use LLMs to code unimportant stuff. Actually thinking what I want to do with the business code is exhausting and I'd rather play a little with a fun project. Also, the unit tests that LLMs can now write (and which were too expensive to write myself) were never important to begin with.