At least BingAI does provide its sources and ChatGPT/BingAI are made to be conversational, so you get the opportunity to ask actual questions and get an answer. As with everything on the internet take the answers with a couple of grains of salt.
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.
The other thing I'm wondering, even though this is veering quite far off the original topic, but: I don't just want all the sources that the AI used in responding to my question, I also want all the other sources that seemed relevant to my question but were for some reason not used.
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.
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.