These days, the best electronics assemblers aren't mere assembly-lines-for-hire, they're full-fledged engineering manufacturing companies. In response to the market threat of cheap overseas assembly, domestic manufacturers have been investing in expertise instead.
Modern domestic electronics partners are now full-featured engineering firms, with on-site staff that know their machinery and the current demands of the electronics market. They keep up-to-date with the latest in industry certifications, allowing their systems to take advantage of the latest innovations.
Best of all, since the prices and cost-of-living have been rising steeply in most of the countries known for their cheap electronics, you can often get a full-featured domestic partner for little more than it would cost to hire an overseas firm.
When you look at the advantages of staying domestic, it makes a lot of sense.