I think these developer platforms like LlamaIndex and Langchain are super great for prototyping and understanding the crowdsourced best approaches in solving these new LLM related challenges.
Depending on how custom the pipelines need to be, you'll either find that you've saved a huge amount of time using these libraries, or you'll find that you have no option but to switch off and build from scratch.
That makes sense. It was my fear that I'd start with a wrapper that helps but end with a wrapper that hurts. Good to know that it's still worth experimenting with these for prototyping and discovery. I'm guessing that there will still be components of them that you can use in a product if you don't want to implement something quite specific yourself.
Depending on how custom the pipelines need to be, you'll either find that you've saved a huge amount of time using these libraries, or you'll find that you have no option but to switch off and build from scratch.