> You’ve implemented streaming and batched actions yourself have you?

Streaming and batching really aren't that onerous to build yourself. Especially if your design goal isn't to support every single LLM provider and related endpoints. And it's the kind of boilerplate that you build once and usually never touch again, so the front-loaded effort amortizes well over time.

With that said, I do think some of the langchain hate is definitely overstated. There's pieces of it that can be useful in isolation, like the document loaders, if you're trying to spin up a prototype quickly to test some ideas. But the pitch they make is that its the fastest/easiest way to build LLM-based application end to end. That pitch I find to be dubious, and thats being charitable.