Firstly I'd point out that the difference here is that all of those things you mentioned are things you could learn and the distinction would be that at least currently the proofs provided by AI are inscrutable. Although this will probably change.

The second thing is to just ask what is there left to do. What are these "greater things" that people can dedicate time to, when clearly even classically cerebral activities like mathematics can be automated away. The industrial revolution already wrecked physical production of goods and made artisan workers obsolete outside of extremely niche scenarios -- that's why we call things artisanal, after all -- but there was still mental work. But now, mental work is also experiencing the same thing, and it's not clear what one should do as a human anymore.

And some people seem outright gleeful about these developments, which can be seen even in this thread. What happens when humanity becomes obsolete? And what happens when the machines that cause this obsolescence are controlled by a tiny amount of people, who suddenly don't need the rest of us? I can only hope that this turns out well for us and that with the development of these machines, humanity will get better, but the omnipresent existential dread is giving me doubts.