I agree with you. But the parent comment reminds me of when Apple started making computers in Austin and HN was full of people saying, "No, you can't build computers in America because America doesn't have any screws, and can't possibly figure out how to make its own!"
Time and money solve all problems. Even supply chains.
If it was only cost... Cost of manufacturing labour is already lower in most of US territorially than in China, and is dramatically lower in other poorer countries.
The saying is that only $2 of iPhone is manual labour.
$2 under which wage? Like, is it $2 at $1/hr or $2 at $20/hr?
If the latter, it's negligible. If the former, it's an extra $39 which is apparently huge in the context of manufacturing.
The age of China being the factory of the world is ending. And that was before Trump's trade war.
https://www.reuters.com/article/us-samsung-elec-china-focus/...
Just screwing parts, and subassemblies coming from China is assembly.
Manufacturing implies integration not on just parts, and subassemblies level, and having much bigger part of the supply chain under one roof.