LOL explain how. Itachi did it that way because it was the only option he had to force Obito to release the Edo Tensei, no other Genjutso would work as DSM Kabuto is immune to Ocular Genjutso.
His eye wasn't broken, it was simply worthless.
Using Izanami or Izanagi has a cost. That cost is that the eye loses his light permanently.
On the other hand if Itachi was to be Edo'd again he should come back with both eyes, as Edo Tensei brings people back to how they were prior to their deaths.
Itachi says he chose this Jutsu because he wanted Kabuto to understand his shortcomings, correct? When Sasuke asked him "Why did you use this Jutsu"
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Itachi chose this Jutsu specifically for Kabuto to help him. It's never once stated Izanami was a last resort, is it? Also...remember Itachi was holding back not trying to kill him. I could be wrong...did Itachi ever say that he has no choice but to use Izanami? I believe he chose Izanami just for Kabuto, but could have defeated him alternatively...just didn't want to kill him.