You seem to be implying all abstractions are equal, its just use-case dependent. I disagree- some really are worse than others. In your webdev example, it would not be hard to contrive a framework designed to frustrate. This can also happen by accident. Sometimes bad products really do waste time.

In the case of LangChain, I think it was an earnest attempt, but a misguided one. So I'm grateful for LangChain's attempt, and attempts to correct- especially since itis free to use. But there are alternatives that I would rather give a shot first.