Why? More jobs are still more jobs, no? In addition, each factories may hire fewer people than 50 years ago, but I hope we have a lot more factories. Having more skillful talent does not contradict my hoping that more Americans will have chance to get a decent job.
It's just so immaterial to US job health.
We have around the same factory employment today as in 1945. Despite growing population by more than 2X. 13M mostly non-skilled. Maybe 5%