and one needs to look at his motivation...
when I was dealing with sig mgt the Oyashios were regarded as the only conventional fleet sub that could dive to nuke depths and take the fight to the nukes - some of the more favourite "public" ascot park runners were nowhere near the ability to fight and manouvre at the same depth
my reading of the sub commanders comments were that his sole interest was to protect their material science advancements with the hull metallurgy - and didn't want anyone to get access to the tech.in fact some of those ex submariners are clearly horrified and are worried that the tech won't be secured - let alone countries like Oz getting access to it. Some of them forget what Toshiba did to the USN
in the broader wash up - the japanese aren't the only ones with those reservations - but the others are holding their counsel.
And the Japanese has developed their own torpedo with much superior operating depth to take the fight to the nukes. Yet, believe me or not, lots of Aussie suppose the German sub is superior because it is "the best seller".......
The whole Soryu export is an idea from their prime minister (Shinzo Abe). the indistry were (initially) not interested about it as "it is too much a hassle for such a small deal", and the bureaucrat were against it (both too much work to do and potential leaks of technical secrets). So when TKMS and DCNS treat SEA1000 as a business (and juicy profit), the Japanese treats it as a mission (in a bureaucratic way). If any Aussie read Japanese's newspaper, you will be amazed how little attention to this submarine export, and if any, usually consider the Aussie get the better part of the deal. Have the team Japan get half the motivation (and PR efforts) they have when selling high speed trains in Thailand and Indonesia, they won't catch up so hard now.
To be fair though, the Toshiba submarine scandal was the work of individuals (a KGB hot chick and a Japanese manager), the "business practice" of Germany and France is a national/government level.
France has been well know to strike an arms sale deal to any rogue states who pays well and had been bidding to lift the arms embargo to china. Even more worse, when Taiwan bought the Mirage jet and stealth frigate from France, guess what, the French sold the same technology (the frigate's combat system, RCS reduction...etc) and the technical secrets on the Mirage jet to China as a compensation. Not to mention the French took RAAF's works on integrating sidewinder missiles with Mirage III and resell it to other nations such as Pakistan WITHOUT PAYING AUSSIE THE IP.
And the German have their dark history too. They have openly sold submarine diesel engines to China (in fact, it is well published in chinese media that chinese engineers solved some technical issues on the engine and German bought the IP back). And, some rumor suggested the chinese's Stirling engine technology was sourced from Germany.