Board Thread:Versus Debates/@comment-31338621-20190129080042/@comment-31715856-20190203063045

He wouldn't know Itachi was an Uchiha... despite being the Hokage of the village Itachi is from... and having a wife who is close friends with Itachi's mom... and being the one responsible for giving out missions to everyone, meaning he knows them ... Ok.

It should also be noted that the Uchiha aren't the only ones who use Genjutsu by by looking into people's eyes. Many visual Genjutsu seem to work that way.

I mean even that aside, my previous points stand. In the higher level fights in the series (basically anything above an Akatsuki member) Genjutsu has almost not even factored in at all. Madara didn't use it to win quickly, neither did Obito, nor Izuna, nor Kaguya. This should show that there's going to be somewhat of a cut off here, after which it matters way way less to a fight, even from a master of the art.