Board Thread:Event Community Discussion/@comment-25730832-20170511175819/@comment-900265-20170513034836

Hyper Shinchan wrote: I would add that "fitted for but not with" probably has always been a thing, just recently the French announced that they're at last giving sonars to the La Fayette class frigates, which until now were being mainly used to "show the flag" around that collection of small islands and outposts that they still have. Similarly the Shiumushus didn't have sonar as built, Shimushu herself received it in January 1943 according to combinedfleet's TROM, and their ASW capacity was marginal, by any standard.

It's because the IJN doesn't improve the ASW capability after seeing how pathetic the USN subs during that time.