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Japanese ASW warfare was definitely their Cinderella service hugely neglected and undervalued it saw too little investment too late .
The only way I can see of getting it marginally improved is by upping the Japanese ASW involvement in WW1 and getting someone involved into a senior position .
The Japanese as an island nation with a very good working relationship with RN could have and should have learned lessons from WW1 . They could probably have had some surplus ASW assets , For example the Kil class .