[throwaway4aday]

Useless is probably not the right word but it's a good way of summing up a lot of the current problems. If the model can clearly identify when something is an exact quote and also know the source then its output could be trusted for the most part and much more easily verified. It would certainly elevate the output of the model from "random blog post or forum chat" to "academic paper or official report" levels of trustworthiness. Citing sources is hugely important for validation, cited text allows an immediate lookup and simple equality check for verification after which you can use it as context to validate the rest of the claims. Like I said, it's a standard we apply to humans who have an equal propensity for hallucination, mistakes, and deception because it's a tried and true method for the reader to check the claims being made.