This essay on Japan's corporate diversification and physical tacit knowledge is an interesting read. However, as an East Asian, my assessment is that this system is heavily driven by Japan's unique, subtle classism. It's a highly collectivist society with strict age-based milestones and immense pressure to secure traditional employment. In Japan, your corporate affiliation often dictates your social standing.
The author paints the lack of shareholder pressure as the secret behind their successful diversification. While true for a few, the flip side is that it created a massive 'zombie company' problem—a heavily discussed issue in Korea and Japan that the West seems largely blind to.
Also, the idea of a 'horizontal culture' in Japan is a myth, especially in software. Even a glance at the Japanese web(5ch, onJ etc...) reveals a deeply entrenched vertical hierarchy. In my experience working with Japanese developers, their reliance on the legacy Waterfall model and an exhausting chain of approvals and reporting was far from horizontal. (Though I admit my sample size is small, it heavily contradicts the Western narrative).
I agree that this rigid system fosters the tacit knowledge needed for hardware and materials. Still, it proves that we all tend to project our fantasies onto cultures we don't fully understand. The divergence in perspectives on HN never fails to amuse me.