I remember one brother who would get angry when people would say that medical practitioners would not be needed in the "New World". He would say, "I guess when you fall and break your leg your bone will magically set itself."
The perception of what perfection is in the minds of most Witnesses is down right nutty buckets. As a child my father once asked me during our Bible study "If Adam and Eve were perfect, free from sin, how were they able to disobey Jehovah?" The question stumped me. Perfect just means free from defect. You don't become like Wolverine with mutant healing abilities. You don't magically have the knowledge of the universe downloaded into your head. The work of your hands isn't with out flaw.