They're also not, even with all our tech crap, drive trucks or operate most warehouses, and they definitely aren't working mining or heavy industry or smelting plants or chemical plants. Or fixing sewer pumps when they break or cleaning up damage after a tornado or hurricane.
Yes, there's automation that reduces the need for labor in at least some of these circumstances, but that's all it is. Reduction. Fundamentally basically everything meaningful requires humans. Machines are, at best, aids.