Specialization pretty much requires it, and our adherence to capitalism demands it.
You specialize to get paid, and by getting paid you can pay others that specialize to create. And you're right, it's a depressing system, but it's no less depressing than what came before that.
You can make an argument that it is more depressing when the compartmentalization of everything also isolates off community. No amount of individual riches can repair a trusted community to engage with. We're definitely getting lonlier in the process.