Intelligence vs Knowledge
LLMs work is being intelligent not having knowledge of everything is ok. But, they have to be intelligent enough (with some degree of knowledge) that where to find the information (search tools or any other tools for that matter)
Not too long ago, the claim was that having multiple Phds worth of knowledge was the real value of AI, but now that's gone and it's suddenly a good thing.
That's a sales tactic -- not a logical position.