You need time for the bottom-up selection process. Therefore, this worked in societies/groups in which the difference between is and peace was quite small, the potential leader had ample of time to prove himself. For me it is quite obvious that nomades or people who hunt in larger groups can really gain from a buttom-up process, to a certain extend Swiss Reichsläufer or Landsknechte belong to the same group. Modern online gamer have of course the same opportunity.
Attemps with chosing superiors by the soldiers in armys of societies with large differences between war and peace usually fail (e.g. French revulution, ACW).
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