You can also directly ask for the sources btw. In the end LLMs with access to the internet can be an abstraction to search engines. If it is good can only be assessed once you actually tried as it heavily depends on your use case and your approach.
LLMs are just a tool like everything else.
I want completeness (i.e. if source material is being skipped, I want to be the one to make the decision that it can safely be skipped), and I want consistency (i.e. I want to be able to double-check that the same set of sources wouldn't also support drawing conclusions that contradict those drawn by the AI).
In other words: I'd still want to use search as a product, and I'd still want someone to solve the search problem for me, even if question answering were a solved problem.