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.
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.