Their docs (incl. getting started tutorials) are content marketing for the platform services, needlessly pushing new users into more complex and possibly unnecessary direction in the name of user acquisition.
(I have the same beef with NextJs/Vercel and MongoDB).
Some time ago I built a rather thin wrapper for LLMs (multi provider incl local, templates, tools, rag, etc...) for myself. Sensible API, small so it's easy to maintain, and as a bonus, no platform marketing shoved in my face.
I keep an eye on what the LangChain ecosystem's doing, and so far the benefits ain't really there (for me, YMMV).