No?

If I use a library, I know it will do the same thing from the same inputs, every time. If I don't understand something about its behavior, then I can look to the documentation. Some are better about this, some are crap. But a good library will continuing doing what I want years or decades later.

An LLM can't decide between one sentence and the next what to do.

The library is deterministic, but looking for the library isn't. In the same way that generating code is not deterministic, but the generated code normally is.