That's a Newtonian perspective which doesn't take phenomenon like the biosphere into account.
The reason we have two hemispheres of the brain is because logic and reason (computation) is insufficient.
Discussion
the right brain sees negatives and reverse of causality
there simply isn't a linear, causality based model for how this thing works, and until the computer has that, it is always gonna be half of what we are, and i would argue that from an energy and economics perspective, millions of years of evolution will not be improved upon in a matter of decades by a bunch of humans with more ego than empathy
phillip k dick wrote a book that tells a story in reverse time... Counterclock World iirc... was a very intriguing read, to be honest i would have to read it a few times more to actually get the hidden reverse timeline in it, i can't imagine how he came up with a way to describe it all backwards... dude was a genius, if you never read any pkd you must
Says who?
Says reality.
The biosphere creates it's own possibility of becoming.
This is not computable, if our brains were computational we'd be dead.
Most mental processes, including both emotion and reason, actually involve both hemispheres of the brain.
Emotion is also calculation, just calculation outside of our conscious control.