It sucks as a search engine. When I'm searching for something, I want factual, correct results, not a hallucinated answer which is backed up by none of its sources.
When I click through search results, I'm reading, evaluating the sources, and synthesizing the information into something which I am reasonably satisfied is true enough. I don't feel comfortable handing that cognitive task off to a machine. The machine's job is to help me find the sources, not tell me what the truth is.
Having a machine that tells you what is true is the most dystopian shit ever, and it would've sounded completely insane only 5 years ago.