Software is way too general. Developing games, misson critical softwares or in a body shop doing crappy consulting gigs at a bank are very different jobs.

When you make a game for a console, mistakes are very costly: it makes a lot of sense to get it right the first time. Attention to details is a trait that Japanese culture really emphasises (always think about every possible thing that can fail, triple check, etc...).

Now, for most software products, that's a different story. I think that's part of the story why you don't see great software companies in Japan.