If all you want is the cheapest flight on a specific day, Skyscanner is really great. But what if you need to book a bus at the other end of your flight? Skyscanner is not going to help you with that, but ChatGPT might! It could search up different bus providers in your destination and cross-reference them against the available flights.
How much you trust ChatGPT to actually do this well is up to you. But I suspect a lot of people will trust it, and I would probably be willing to use it for low-stakes tasks at least.