I'm well aware of what living like that would mean to the world's population. It's not a past form of society. There are still some people who live like that today, and I do plan on joining them the first availability I get. But how do we know that trees don't communicate with one another? Or lions, grass?? We don't know these things so we shouldn't assume one way or another. I'm against these "advancements" because I view a lot of thing as resisting change and not letting natural selection/evolution follow its natural course. If a person is stupid and jumps off a roof and breaks their leg, we mend them up and they go off and have children of their own. In a natural world, this person would not be able to mate thus not passing on his genes of thinking jumping off a roof is a good idea.