For die-cut plastic cards (think custom-shaped gift cards or hotel door hangers), I reached out to several US manufacturers for quotes and most never even responded. The one that did respond basically laughed at me and said my design was impossible to cut. So I went on Alibaba and had tons of quotes instantly and found a manufacturer. Not one of the responses were concerned about the design's manufacturability. And the manufacturer I picked does an incredible job with what is admittedly a challenging die cut design.
As a tiny business, most of my orders end up being under de minimis (which is actually great for helping small businesses avoid the overhead of dealing with tariffs and level the playing field against large players that can be much more efficient at handling regulatory overhead through high volume).
But with the change to eliminate de minimis and increase tariffs another 10% essentially overnight, my COGS is going to increase ~30%, which means either I shut down my business due to losing nearly all of my margin, or I increase prices substantially. It just hurts consumers AND small businesses like mine in the US.
There isn't a US manufacturer I can switch to (again, price wasn't the issue). And the US manufacturers in the space that WERE still selling products despite the international competition will just increase their prices now that competition is more expensive.