I've been to a middle school Christmas orchestra event (before coronavirus) and the kids spent a lot of time practicing for it.
It wasn't very good.
Is playing a music instrument a waste of time for people if the vast majority of them aren't going to make money playing an instrument?
I completely agree with you. Of course there are some things that chess do for you, make you a little bit smarter, and lots of other stuff. Video games don't do anything productive unless you are really good or entertaining and risk it to become a youtuber. But chess is fun, it is a beautiful game, and it is really fun to talk about with other people. I wouldn't say it is completely useless, it is more productive than videogames.