Just think about it abstractly. Variation decreases as n count increases. Large organizations will tend to be similar. As you note most large private systems end up behaving similarly to large public systems in terms of corruption, inefficiency etc….

But notice that it’s driven by the n size. If you look across smaller systems, you’ll notice they are more diverse. Like startups. Smaller n means more variation. Occasionally a small variation or mutation will push evolution forward. Public systems are generally to large and risk averse for that sort of evolutionary adaptation. At least at present. Maybe we can make public sector more like startups by changing how tax dollars are spent, not necessarily changing the amount spent, but the way it’s spent? I don’t think we’re there yet.