The ability of the state to ensure law and order, property rights and security within and to both defend its territory and resources and project power externally are all crucial to the wealth of nations.

The most powerful wealthy nations amply demonstrate this. The USD 'petrodollar' SWIFT global monetary hegemony and the extraordinary privilege and wealth it confers upon the USA is a specific contemporary example.

Failed states demonstrate the crippling effect on citizens of of failure of government...

Go live in one if you think the nation state is so unimportant to the wealth, security and opportunity enjoyed by citizens. Please report back on how it goes for you. Good luck!