Remember how Apple couldn't just pick up and move the production of iPhones to India or Vietnam? You need all the ancillary industries around the production to be there, along with being competitive and commoditized as well.
When a supplier has something go wrong a line of manufacturing doesn't go down. You go down the street to the same guy selling the same thing and have them pick up the slack. If you want a 1uF ceramic cap come hell or high water there's going to be a dozen people selling them all quoting a price a little above cost. When Apple moved production to India and Vietnam? When you hear Apple talking about a few billion in investment in Indonesia? This is what they're helping set up and what takes a decade to do.
Anyone can buy automation equipment but there's nowhere in the US you can do what JLCPCB/PCBWay do with PCB and electronics assembling because we literally don't manufacture all the ancillary stuff required in the US, little alone manufacture it all in the same place. If the SMT components are manufactured domestically say for military purposes it's going to be spread out all over the US because politicians pork barrel contracts for their districts and states.
You could setup next to a Mouser distribution hub but Mouser is a middleman and they have you over a barrel. What do middlemen do in that situation? They raise prices just enough to the point where it's uneconomical to leave.
You metaphorically need to invent the universe to make it work in the US.