A thus altered human will be essentially a brain and spinal cord with life support structure. Able to be plugged directly into anything from a earthmoving machine to a spaceship. Man at this point will be free to roam any environment, and he will become the master of all. We carry with us evolutionary baggage. Attributes both physical and social that originated in that Odd Little Primate.
Evolution is a violent and bloody process, full of stress and horror and gnashing of teeth.
Our bodies are built for fight or flight and not suited to calm easy times. Likewise our behavioral attributes are built for conflict. We Hate and Fear and Lust and are full of Self Pity because it comes naturally to us. They are the four basic instincts. They are also attributes we should leave behind on our way to the next evolutionary plateau.