The development that probably hurt it is the reduction of open range herding. In history, people could just let their cattle roam freely and find food since the plains were huge and nobody lived in them. Nowadays, this can be problematic because there are more and more people and settlements and roads with cars so free range herding has been drastically reduced which cost the herders a lot.
The Mycenaean civilization during the dark age became a time of destruction. There were invasions,earthquakes and famine (little food). With the collapse of this civilization and sudden disappearance of writing evidence we have little knowledge as to what really happened during the dark ages.
Egyptians ment the afterlife as life after death. Egyptians thought of it as a good and ideal place to live as everyone there was happy.