Tachi: Kaiten and Tachi: Fudo Attack bonus.
I would like opt for a minor buff to Tachi: Kaiten and Tachi: Fudo (if not Tachi: Fudo at least Tachi: Kaiten) both are limited in use against high defense NM's even when geared properly with high end attack food up Tachi: Yukikaze (Y),Tachi: Gekko (G), and Tachi: Kasha (K) will still out perform them on these NM's. I also would like to hear other Relic/Empryean Samurai's thoughts on this as well.
For many years I have heard many people making negative comments about Tachi: Kaiten not being as effective as Samurai's Y,G,K WS's against high defense NM's and HNM's since the buff to Y,G,K, Tachi: Fudo also shares the same issue with Tachi: Kaiten.
With newer Battlefields and HNM's arising soon I can see this as a major drawback for Amanomurakumo and Masamune Samurai's.