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Where was it said or shown that he can use Genjutsu from any body part? Finger Genjutsu is easier to avoid than regular Genjutsu. When you can sense the position of your foe and when your foe needs to camp in a giant chakra construct to avoid a blitz kill there's no need to even look at the opponent's body at all.
Apex's thread regarding Genjutsu hit it on the head like 2 years ago? Itachi stated he needed just a finger to cast Genjutsu. Keyword being just. The application & execution to form, then project Genjutsu can be applied to any body part, because its just the gathering of chakra, then projecting it onto others.
That's how I see it.