Second hand knowledge, but I was told they're detailed oriented because they basically don't trust anyone to tell them when they're wrong. The culture is so adverse to causing offense, that instead of reporting a mistake to a colleague, errors are sometimes allowed through and "engineered around" at the next point of assembly.

There were a lot of nuances to how this sometimes became self correcting and sometimes caused project failure, but as far as I can tell, that applies to everything Japan.

Firsthand sidenote: A similar cultural thing is being ashamed at anything less than proficiency, and will "pretend" to have no knowledge of a topic if they're not an expert. For instance, most people will claim to not understand English, because they're not fluent. But make no mistake, they understand 95% of what you're saying.