The issue is when you build in North America, you have to deal with local parts suppliers for all parts and subassemblies. Then you have a problem of the North American culture of poor quality control and maximizing profit margins only. So you can have a great design, which works in Japan with Japanese suppliers, but then it falls apart with local parts makers in Canada and US. Some sub-assemblies cross the border 2-3X which just amplifies the typical shit quality of manufacturing in North America.