I use coding libraries which are either custom, recent or haven't gained much traction. Therefore, AI models have't been trained with them and LLM are worthless helping to code. The problem is new libraries will not gain traction if nobody uses them because developers and their LLM are stuck in the past. The evolution of open source code has become stagnant.
Why not feed the library code and documentation to the LLM? Using it as a knowledge base is bound to be limited. But having it be your manual-reading buddy can be very helpful.
I don't understand why people feel the need to lie in these posts. AI isn't only good at using existing codebases. Copy your code in. It will understand it. You either haven't tried or are intentionally misleading people.