The useful distinction here is that RAG vs. fine-tuning is really a question of where you want change to live. If business facts change frequently, keeping them outside the model makes the system much easier to update and audit. But even with RAG, retrieval quality becomes the new failure point stale indexes, poor chunk boundaries, missing permissions, or retrieving the wrong version of a document can still produce a confident answer.

In production AI systems at IT Path Solutions, I’d also separate factual grounding from behavioral adaptation: RAG for changing knowledge, fine-tuning for stable behavior, and explicit evaluation for the boundary between them. That makes it possible to measure whether a bad answer came from retrieval, model behavior, or outdated source data instead of treating everything as a model problem.

“RAG first, fine-tune later” is therefore less a shortcut than a useful way to keep changing knowledge out of the model weights unless there’s a concrete reason to put it there.