Yeah this isn’t true. While automation has made machines more effective than humans in many cases, they haven’t made human labor less effective. Not sure why you would think that. Advances in tools and software have made every sector of the workforce more productive. There’s a million little things.

They have flattops at fast food places that cook the top and the bottom of the burger patty at the same time. So one worker can do more. Roofers have faster and lighter nail guns letting them work for longer. Hell, when I did lawn care as a teen you’d see another crew with some fancy new mower every month, and the improvements were usually worth the costs.