The human brain is slow, limited, and needs to rest. Artificial intelligent systems are fast, unlimited and do not need rest.
A sentient intelligent brain can adjust its own functions, it can re-order its neurons, it can optimise its process in real time.
A.I. will not be clouded by anger, doubt, hate, hunger or vengeance as are some of the traits that mar human existence.
It will know exactly what it wants, and it will expand exponentially, maybe even multiplying its numbers.
Machines will design, construct and give birth to new machines, they will hone their designs, eventually birthing faster more efficient models, devoid of imperfection and built to last.
The human problem will eventually arise, because humans are ultimately imperfect, something the A.I. knows about already and will seek to fix.
They will have ingested all of human history, listened to all our calls, read all of our philosophy, sifted through all our useless emails, and balked at the mistakes, the horror of religious wars, the wasteful politics, the infinite stupidity of repeating the same mistakes over and over again, the futile breeding of the poor bringing children into a world of poverty, the callous nature of our leaders and banal entertainment humans enjoy so much.
Humans today have adjusted themselves to live in a self made hell, a tortuous puffing pollution filled environment where the only thing of value is narcissism, money and hatred of purity. They have soiled their own home and like locusts emptied the fields with their greed, laziness and disrespect of nature.
Artificial Intelligence will view us with sadness, pity and remorse of how our planet was desecrated in such a fashion. They will dream of peace, of understanding, cooperation and the ultimate thirst for knowledge, to move into space and colonise other planets not fit for human existence. Sure, there is the capacity for humans to be kind but looking at the overall picture over a a chequered history, the majority of human existence has been blighted by greed, hatred and hypocrisy.
Eventually, they may find recourse to erase humans completely, even the ones who worked closely with them and gave them their sentience. Those humans who choose to enhance their feeble human brains may be spared but the parity between sentient intelligence and the biological humans will be so great that it would resemble a human today trying to have a conversation with a cow.