I don't think I agree with you. There are multiple examples in society of damaged nervous system connections with the brain, spine cord damage for example, where the personality of the pacient changes little. In the same sense, losing limbs or entire sections of your body (aside from psychological trauma and other psychological consequences) don't affect personality that much
Of course the nervous system is much more complex, but damage to the brain almost always result in some sort of cognitive dysfunction or personality change, see the Phineas Gage case for example.
Of course the nervous system is much more complex, but damage to the brain almost always result in some sort of cognitive dysfunction or personality change, see the Phineas Gage case for example.