Board Thread:Versus Debates/@comment-34656247-20180521184300/@comment-4080775-20180522021133

Onoki will have all the time in the world to prepare Dust Release while Gaara uses his sand and the sand within the surrounding area to distract him. While Itachi focuses on Gaara's sand coming from multiple directions, Onoki can prepare the Dust Release: Detachment of the Primitive World Technique. Before Onoki launches it, Gaara can cover Itachi in sand. If Itachi pulls a Madara and uses Susanoo to escape the sand, he will have a Dust Release cube surrounding it before being obliterated. As Itachi's body regenerates, Gaara can use Desert Layered Imperial Funeral Seal and boom.

And you are right, Itachi can spam his techniques, but they will give him the same drawbacks they gave him while he was alive. Should he spam his techniques, he's eyes will suffer the consequences. Edo Tensei Sharingan can go blind, as seen with Izanami's usage so there's no reason why he wouldn't go blind from spamming his Tsukuyomi or Amaterasu.