Chess and games can be a lot more demanding than a lot of people's work lives - and AI is already superhuman there.
The heaviest thing I need to lift in my daily life is a laptop and yet I've gotten significantly stronger over the last few years from strength training.
If AI took over all the boring but hard things I'm required to do it'd free up lots of time for me to spend thinking about things, and solve problems I find more interesting.
It seems clear to me that people will continue to think, but in different ways.
I hate to bring this analogy up again, but it seems impossible to escape: did losing the ability to do long division really impact humanity?
It is already relieving people of need for thinking. Today the need; tomorrow the ability.