My whole qualm with this AI integration into search engines: it's a search engine, not a question engine. I go to google to search the internet for something, not ask it a question. IMO, asking AI for something is a different task than searching the internet. It's sorta the same problem as if I go into a store and ask an employee where something is, and they reply with "well what are you trying to do?"
I sometimes wants a search engine, sometimes a question engine. Likewise at the store. Why not have both with a way to choose which one I want on the moment?
If you want a search engine, it's easy to use the results as a feedback to refine the query. But a question (answer?) engine would need to be an expert in the subject. And not parroting stuff. That usually means curation. You need something to do the work ahead to filter the wheat from the shaft. I don't see how LLMs can do that.
LLMs can't be a search engine, and can't be an question engine. The best way to treat it is a simulation engine, but the use cases depend on the training data. But the proof is there that the internet is full of junk, and not that expansive.