Someone pointed-out that Black people have pale skin on the insides of their hands, same for people of India..

& that at night, in a tribal village ( without electric lighting.. ) that would make communication Italian-style, with gestures, work MUCH better..

Enough-so, that if there were any proto-humans who didn't have that pale-gesturing-skin on them, they .. apparently didn't survive the last few million years of Natural Selection..

The more dimensions of immersion/communication, the more effective the immersion/communication.

Nintendo made a mint on that, when they ignored the higher-graphics-resolution paradigm that their competitors were working on, to instead add-in motion/gesture, & the immersion-multiplication that that provided..

More dimensions is a fundamental advantage!

Perhaps if you ever get into a discussion with someone who's deaf-enough that they lip-read, instead of hearing you, you'll discover/feel how disturbing/"wrong" it is, to have no eye-contact, when discussing something..

But the fact that they can discuss things with one even though they can't hear well what one's saying .. that, too, is natural-selection advantage, through our ancestors..

Sometimes the flourishes that evolution produces are directly-significant ( like the items I've listed above ) & sometimes evolution produces negative-flourishes, like male-pattern-baldness ( after youth, male-attractiveness becomes irrelevant?, as far as evolution is concerned? genetic-reproduction's already settled, then, right? )

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