Unsurprisingly, the companies you listed churn out some pretty terrible code. Square Enix for example has pretty big problems with ffxiv because hacking and botting is so easy. Maintenance windows have gotten longer and are occurring more often in an effort to patch vulnerabilities. Just last week players who were in a specific city accessing their retainers (personal bankers) had their money flushed from their characters by hackers who compromised the trade cluster and transfered it to their bots by listing bogus trash items for millions of gold.

Sure, but it's not like companies in western world don't make similar mistake. WoW/DB3 have plenty of exploits too. Bad code are produced by everyone regardless the cultural or native language background.

Japan's engineering prowess - very distinct from any sort of design prowess. Look at the classic example of Honda and Toyota, two great engineering companies who succeeded in spite of their design. The early Toyotas were derided as ugly little box cars, and their only redeeming value was that they were cheap and well engineered.

Or possibly that is good design prowess - if you're Japanese.

I would argue it's less 'good' design and more that design is a secondary, or ever tertiary concern - which, from an engineering standpoint, it is.