Is chess an obsolete game now that computers are better than humans?
Is strength training obsolete now that we have machines that can easily lift much more than humans can?
Are bicycles obsolete now that we have cars?
Is walking obsolete now that we have bicycles?
Computers can certainly play a much better chess game than any human in the world can play. Computers “think” about chess differently, but they do have the advantage of being able to “look” further into the future while analyzing each possible position accurately.
So, if you’re a human and you want to play the most accurate/brilliant chess games ever, you’re already guaranteed to fail.
But you still appreciate a nice walk, even though you own a bicycle, and you still use a car or public transportation at least some of the time.
And if you go to the gym, you never think about the fact that a mechanical crane can “deadlift” much more than you can!
For the same reason, it simply doesn’t follow that chess is obsolete.
Even though humans are much less accurate at playing chess, there are numerous significant benefits from playing this and other strategy/logic games on a casual (or even serious!) level. These benefits can be applied to the rest of your life.