What is fragile? We have had specialized roles for the entire history of society and it hasn't caused anything to crumble. You should read Collapse Of Complex

What is fragile? We have had specialized roles for the entire history of society and it hasn't caused anything to crumble. You should read Collapse Of Complex Societies by Professor Joseph Tainter. Tl;dr a step change in complexity of ancient societies more often than not lead to their downfall. They were unable to train/retrain specialists quickly enough to deal with surprises.