Well very many people think it's fun to watch sports or other competitions regardless of if a robot could do it better. I don't think anybody cares about if its "solved" or not, it's just fun to see humans interact in a controlled dramatic way I guess.

Chess also has the added bonus of providing a lot of interesting puzzles for those interested, they can sit and analyze lines with engines after the games as well or watch Agadmator on YouTube analyze it. It's fun!