Most “unskilled labor” is heavily skill dependant. You wouldn’t want a chef, builder or painter who didn’t know what they were doing. And for production: machinists, mechanics and foremen make or break profit with their skills.
So what’s a better name for these jobs?
Edit: I have been told that plumbers don’t qualify as unskilled, and as such they have been exchanged for painter.
I served for about 7 years. None of the individual tasks are particularly difficult in isolation. The skill is juggling a couple dozen simple tasks quickly and efficiently in a chaotic environment. That is much more difficult than it seems.