"The main advantage that agricultural civilizations had was population size."
Metallurgy?
Not just firearms.
Stone axe vs bronze sword?
Bronze sword vs iron sword?
Iron sword vs steel?
Nomadic people got their advanced weapons usually through trade from settled ones. The nomadic horse archers dominance was rather an exception, also their kingdom included cities where the weapons they used were made.
"Without any external pressure, multiple peoples concluded that settling and eating grass was preferable to being nomads"
And there always was external pressure. Also .. our knowledge of that time is just fragmentary. We don't even know the real names of those cultures.
So yes, clearly there were benefits to settling and planting corn, otherwise humans would not have done it. But to my knowledge, it is not correct to call it a voluntarily process in general. Once there are fences, the nomadic lifestyle does not work anymore. Adopt or die out was (and is) the choice.
1 v 1, the average nomad could kill the average conscripted peasant who was physically weaker and less experienced. An iron vs a flint spear isn't going to make nearly as much of a difference. Superior numbers for the creation of a professional class of fighters that conquered the weaker nomads, but the steppe nomads remained superior in combat. The Roman, Chinese, Persian, and Muslim empires were only able to keep them at bay by turning them against each other. When they united, they were completely unstoppable.
With the Romans, the situation was the opposite. Their success was mostly based on the idea that conscripted peasants will eventually beat elite warriors. You just had to equip and train the conscripts instead of wasting the resources on the elites.
Because every man was expected to fight, the Romans had an effectively endless supply of experienced and well equipped soldiers. A society depending on a warrior class might win once or twice. But the Romans would still inflict some casualties. They would learn and adapt, and come back with another army next year. Sooner or later, the warrior class would be depleted, and Rome would prevail.
Eventually the Roman Republic grew large enough and successful enough to switch to a professional army. Not because it was better, but because the population was too large. There were not enough enemies to fight to make conscription useful.
Steppe nomads were far from unstoppable. They had occasional success in conquest, but their societies were set up to fail. The legitimacy of their leaders was based on personal relationships between the elites. When the leader of a large empire died, it was always unlikely that all leaders of note would support the successor. Most of the time, the empire would fracture into effectively independent polities. Sometimes there would be a figurehead leader on the top, but he would rarely have any real power over other leaders.
Metallurgy?
Not just firearms.
Stone axe vs bronze sword?
Bronze sword vs iron sword?
Iron sword vs steel?
Nomadic people got their advanced weapons usually through trade from settled ones. The nomadic horse archers dominance was rather an exception, also their kingdom included cities where the weapons they used were made.
"Without any external pressure, multiple peoples concluded that settling and eating grass was preferable to being nomads"
And there always was external pressure. Also .. our knowledge of that time is just fragmentary. We don't even know the real names of those cultures.
So yes, clearly there were benefits to settling and planting corn, otherwise humans would not have done it. But to my knowledge, it is not correct to call it a voluntarily process in general. Once there are fences, the nomadic lifestyle does not work anymore. Adopt or die out was (and is) the choice.