While I can’t say any of this is wrong, you’re missing likely the single biggest component inflating the cost of US manufacturing: profit margins. Every step of the supply chain has a profit margin attached. Sometimes just a few percent, but often double digits. These compound, so a 5% margin on a simple component will see an additional 15% when sold as part of an assembly, which is then marked up another 20% when sold as part of the finished good. There’s also financialization which burdens US companies. Companies generally need to take loans to fund their operations, and end up having to pay heavy interest fees and rent which also drives up cost. Workers and environmental protections are more expensive, but in practice they are relatively minor compared to a lot of other inefficiencies US industry struggles with.