Your post implies that Ford OEM parts are not offshore. Some parts are made at Denso in Maryville, TN and other places, however, many, if not most OEM parts are made outside the USA. Obviously, Ford has people that oversee the factories.
Many cases over the years where OEM parts were faulty and fail such as O2 sensors. It's not like Ford makes the components for the car themselves. The microchips etc all are "offshore".
I've bought Non-OEM parts such as alternators for cars and had great luck. Recently I bought an Oil Pressure Sending unit for our Jeep and bought OEM because it's a known fact the aftermarket part fails and has inaccurate reading. I think the results vary and it's effectively stereotyping to say all OEM parts are superior.
One last point, there are cases where one Motorcraft Alternator costs as much as 3 aftermarket ones, many of which have a good build quality and good reviews and longevity.
Just my 2 cents.