As long as you're sticking to the well-established stuff, it tends to be quite factually accurate. I think it's really underrated as a resource for good high-level overviews of fields where those overviews otherwise don't exist at all, are overly technical, or the existing overviews have a lot of author bias.
I'm talking about general overviews of topics, where a good book form at the level you're looking for often doesn't even exist.
You're talking about a classic book that is recognized as a great work.
Nobody's claiming that what ChatGPT outputs is Cosmos. And most books written by people aren't Cosmos either.
And most of the time when you want a basic factual introduction to a field that is at your level, neither too popular nor too technical, ChatGPT is really good at providing that.
Not everything has to be Cosmos.
Four Laws That Do Not Drive The Universe, The: Elements Of Thermodynamics For The Curious And Intelligent