The human brain does not have perfect memory. It is not always logical. And more often than not it is motivated and influenced by "external" forces - health, hunger, sex drive, environmental conditions, luck, spiritual inspiration, or whatever. The perfect worker is purely logical and has perfect memory and no external influences - never gets hungry or sick or wants to be the boss themselves. The AI race is funded by folks interested in creating the perfect worker, not a human. I have to agree with the conclusions of this paper that they won't be able to make humans. (But they don't really want to.) The Vatican has also published interesting works on this idea. The question is - if you take out everything that makes it human, can you call it intelligent?