I think it was
@david_chisnall who pointed out earlier that coding LLM's will become much less useful when we stop doing (expensive) training to keep up with breaking changes in API's.
Well, I just spent two hours trying to fix some code that was buggy because the API changed less than a year ago and came to the decision of reading the F manual and write that 200 LoC myself.
(to be fair, I think this would work if the LLM had access to a complier and runtime)