I use Gemini almost obsessively but I don't think feeding the entire corpus of a subject would work great.

The problem is so much of consensus is wrong and it is going to start by giving you the consensus answer on anything.

There are subjects I can get it to tell me the consensus answer then say "what about x" and it completely changes and contradicts the first answer because x contradicts the standard consensus orthodoxy.

To me it is not much different than going to the library to research something. The library is not useless because the books don't read themselves or because there are numerous books on a subject that contradict each other. Gaining insight from reading the book is my role.

I suspect much LLM criticism is from people who neither much use LLMs nor learn much of anything new anyway.