User blog comment:Nakama Power/Nakama Power's Equipment setup guide/@comment-26154973-20151222032251

The increase from 3rd torpedo on a DD is ~20 post-cap points (10 for Yuudachi), while the full increase you can get by switching from double attack to torpedo cut-in (with 3 torpedoes) is 90-100 points for DD (with 3 DD that can have 300+).

Also, for Kitakami and Ooi torpedo cut-in gives only 20 points if compared to double attack (mixed cut-in gives 15, so one can say it's preferable if you want cut-in on them anyway), so many other ships can benefit from switching to CI more (Kiso, CL, esp. Jintsuu and Abukuma, CA, Bismarck, even other BB with mixed cut-in).