This is one of the objections I have when people talk about how useful LLMs can be for literature searches or for any kind of search, really. Even beyond the biases that inevitably (and, in some cases, intentionally) show up, part of a good literature search is seeing information *in context.*
Part of research is wandering in the literature and making unexpected connections, finding the questions you didn’t know to ask. I don’t see a good way to do that while relying mainly on LLMs to do literature searches.