We are hyper-specialized, hyper-optimized, hyper-focused cogs in the massive survival machine that is the world economy. So much so that we can no longer see the forest for the trees. But I firmly believe the forest is still there.
Supply chain problems of the last few years continue to show us just how fragile of a world we live in. Jobs we've never heard about, performed by poor villagers from places we don't care about, are arguably more important to our survival than musicians and baristas.
It doesn't seem fair to ask the people providing goods/services necessary to our survival to support the chosen others who get to follow their dreams. Where do I sign up?
I think you're spot on with your comment about finding 8 billion useful things to do. A barista may not be helping us survive, but at least they're making the place a bit nicer for the rest of us. The musician will trade his time/music for a nice cup of coffee. It may not be survival, but it improves the overall human experience. We're all in it together.
We're going to reach a point where there isn't anything more people can do to make things nicer. Automation will eventually lead to a crisis, where people no longer have any useful value, and simply breed and consume everything around them in ever larger amounts.
A world where everyone is free to pursue their dreams doesn't seem like a utopia to me. Humans free from all constraints sounds like hell to me. Devil will find work for idle hands etc. Must be a really good sci-fi novel in here somewhere.