The US has 50 states, and each of those states have counties, and each of those counties is further subdivided, and each of those subdivisions is again subdivid

The US has 50 states, and each of those states have counties, and each of those counties is further subdivided, and each of those subdivisions is again subdivided, and sometimes even once more. And each of those jurisdictions is full of people, some quite wealthy, who can make decisions with the wealth that they generate in their own lifetime. And even beyond their own lifetime, by donating generously to churches and hospitals and schools and universities and parks and so on. There's plenty of parallelism, and even plenty of ways to invest one's wealth in meaningful pursuits posthumously without passing it to your offspring. I don't see why third generation aristocrats are needed to achieve the diversity and parallelism you seek.