Izanami.
Izanami is not useless in combat in its defined form of approach.
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If it's 1 Vs 1 = It can be usefull.
Specialy if you do not want to kill your opponent and change your oponents way of thinking and bring your oponent to the right path.
It's explained by Itachi/Kishi how it works.
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Possibly there is alot room to play around with Izanami = Great variety in it.
It comes down to the battle of "choice".
But it's still a "cause" and "effect" type of situation.
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We have seen the Itachi form of Izanami so far , but we could see some of them from other flashbacks.
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Also it appears to me , that Izanami = is not suitable to all of oponents.
It will most likely work on those who had altered or deceived their ordinary fate/destiny in a way where they are not aware of the change anymore.
If that person who is in Izanami = and becomes aware of ones fate/destiny.
Will be released from Izanami.
Izanami is actualy very easy to activate = but very hard to get out , since it's a jutsu to choose the destiny.
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I hope that helped^^.
:scorps: