There was a good blog post on bicycles and tariff's earlier this week[1].
A key point was that volume really matters in what you can onshore. Whether you go for full automation or not, dies, tooling, machinery etc. all need to be amortized across what you sell. High-volume, low-end products are relatively easy to amortize, being both less demanding to manufacture and having higher volume. Such products are usually made in several factories around the world. Specialized, high-end stuff tends to be much harder to sell in large enough quantities to be economically viable. In many cases, one factory serves the entire world and barely makes a profit.
The Tariffs and counter-tariffs currently being implemented create a barrier around the U.S. market. If a product is low-end and high-volume, then it may make sense to manufacture it in the U.S. if it wasn't made there before, primarily to bypass the barrier and serve the U.S. market as profitably as possible. Exporting from within the U.S. may not necessarily make sense. Not all low-end, high-volume products will be onshored either. For low-end products in which manufacturing costs are a small portion of the consumer price, simply paying the tariffs may make more sense.
Manufacturers of high-end, low-volume products that rely on access to world-wide supply chains and markets are unlikely to move to the U.S.. The U.S. is a big market, but the rest of the world is bigger. High-end, niche manufacturers currently in the U.S. may be forced to consider moving abroad or shutting down. Many high-end, specialized products will become more expensive in the U.S. and there will be no domestic competitor. Some products that are barely profitable now will simply be impossible to make with significant trade barriers around the U.S. market and will cease to be offered anywhere.
Dividing up the world market into walled off economic regions is, ultimately, likely to reduce the range of high-end, specialized stuff that the world can produce. If countries insist on a higher degree of self-sufficiency and throw up trade barriers, there will be things we all simply stop making.
[1]https://news.ycombinator.com/item?id=43572820