Rightly or wrongly, many US
Rightly or wrongly, many US customers perceive cars built in Japan to be of higher quality than cars built in the US, likely because Japanese car manufacturers (Toyota, Honda, Mazda) tend to be more reliable than US car manufacturers (Chrysler, Ford, GM). This may be unfair perception, after all, Mitsubishi and Nissan are Japanese cars.
Anecdotally, the Crosstrek, manufactured in Japan, has received higher reliability ratings than the Impreza, built in the US. This swapping of manufacturing plants will be a good data point to whether the Indiana plant is as good as the Gunmo plant.