https://en.wikipedia.org/wiki/Samsung
Samsung is also very closely tied to the Korean government.
>I think if you start to deep dive into the industries that left, you'll find the reasons were often more complicated than simple labor costs
Care to share any of the reasons?
Here are reasons that I know about; EPA regulations, OSHA regulations, their supply base relocating.
https://www.forbes.com/sites/stevedenning/2011/08/17/why-ama...
Don't get me wrong though, we shouldn't roll back our regulations but we should however ensure that what we buy is manufactured in that same conditions that we would demand at home.
Governments being laser focused on building a specific domestic industry and winning. I.e., as you point out, Samsung. It's hard to win a battle where an entire country has decided to push to become the best in the world in one field.
I think if you start to deep dive into the industries that left, you'll find the reasons were often more complicated than simple labor costs. American companies did get out-competed by foreign firms in a lot of key areas.
America is large, but they can't expect to be the best in the world at every industry. If an entire country focuses on a specific niche for long enough, it's possible they will become the best. Samsung and TSMC are incredible companies that didn't happen by accident. And yeah, the USA might not compete at that level on the global stage, but the American economy is also not so completely dominated by one megacorp either.
Also, a lot of manufacturing, especially the high tech stuff, is highly automated. So these massive factories don't generate the same number of jobs they once did. And the jobs they do generate are often technical. More maintenance and calibration of machinery, and less putting bottle caps on.