The reason those jobs haven't been automated is because automating a job is an expensive and difficult process, not out of charity for the people doing those jobs.

I've often thought about how meaningful my own work is, in the sense that: what if people just didn't buy my company's stupid product? Would anybody be worse off? Not really.

The only meaning I've found is the satisfaction of doing my job well, on its own terms - whether that's sweeping the floors at a burger joint, or making software builds.