It's worse than that, a 15% on completed product, you still make the same amount of money selling, and when buying the parts. Only the consumer feels it.
Build here and you pay the costs, you're putting the money up front and don't know if consumers will even bother buying at the higher prices you have to charge to make up for material tarrifa.
You'd have to be an absolute idiot to exapnd American manufacturing right now, especially knowing anything can change daily...