I think both attempts of explanation are valid. While the risk-adverse and face-losing-adverse traits of the Japanese culture can explain the (in general) slow development and response of Japanese companies (not limited to software), they cannot explain the quirky, often ugly and not user friendly UI of Japanese software. Germans are a bit risk-adverse, too, though not comparable to Japanese, their software, especially enterprise software are showing the same rigid UI and in general difficulty to use. In fact, you can not use them without reading the manual or being trained and that is expected from the end users, too! In a stark contrast, user-oriented software today are very intuitive, offers pleasant onboarding thus every user can use them casually. The rigid and unfriendliness of Japanese and (German software in some degrees) can IMO only explained through the long isolation of the mass market as Romeo outlined in his podcast.
