Want a fancy job? This is one of the hoops to jump through. Same as leetcode further down the line, you won't do it at work but you will do it to get work. But that's also a pretty tragic take on it.
Practice for other things, sure, that is also a way to see it. You won't bench press the other team but you will make yourself stronger. But for what? A sport you'll never play? What are you preparing for?
Here's another one. Math, especially pure math, is a thing that is totally separate from observation. It just sort of exists without being anywhere, and yet there's all this depth to it. You can get a puzzle that cannot be solved by any anything other than thoughts, and you can keep building on these puzzles that don't exist. Go nowhere and explore.
Lastly I note that it's mostly math class that gets asked this "what's the point" question. But you may as well as this about everything else you do in school, and you will mostly find that you'll have spent years to learn French for 4 weeks of actual use in France, dissected frogs for no reason, and learned how to play the recorder. All things that I'm sure you can find positives for despite the superficial benefits being quite small.