Easy explanation from a Japanese American:
Japanese people commute a lot by train and have not-so-big TVs in not-so-big houses/apartments.
Americans drive a lot of cars and live in larger houses and love gargantuan TVs.
Japanese men often carry bags and man-purses to carry all their devices.
American men leave the house with a wallet and a phone.
Smartphone adoption rates aren't as high in Japan as they are in America, so Vita's smartphone-like features are very appealing.







